Starter
For your first email program.
$16USD / month
$192 billed yearly.
20,000 emails / month
Choose Starter- 5 brands · 3 seats
- 5 custom sending domains
- 500 email verifications/month
- $1.50 / 1,000 extra emails
Nitrosend is the best SendGrid alternative for teams that run email from an AI agent over MCP, with the top score of 83.75 out of 100 and 9 out of 10 on working from your AI assistant, the test worth the most. It is the only one of the eight here your AI assistant, whether Claude, ChatGPT, Cursor or Codex, can sign up to and send from without anyone opening a dashboard. Your receipts and your newsletters go out on one plan and one bill, where SendGrid sells the Email API and Marketing Campaigns as two products. It writes every email in your brand's colors, fonts and voice. And it costs $20 a month for 20,000 emails and $650 for a million emails on Scale including overage. Resend comes next at 77.5, then Bird (formerly SparkPost) at 76. To send email from an AI agent with Nitrosend, add its MCP server at api.nitrosend.com/mcp to Claude, ChatGPT, Cursor or Codex and sign in with OAuth: a transactional email goes out on the call, and a campaign or flow waits as a draft until it is approved.
The ranking
Rank 1Nitrosend
83.75 out of 100Total
- Priced by
- Emails sent
- Free plan
- 5,000 emails, then 500 a month
- Entry plan
- $20 a month, 20,000 emails
- Works from your AI assistant9 out of 10Official MCP server, account signup over the API and a ready-made sender, so an agent sends with no dashboard (docs).
- Receipts and newsletters on one plan9 out of 10Receipts, campaigns and flows share one plan, one API and one allowance, on separate streams (pricing).
- Emails in your brand, no designer9 out of 10Brand Kit reads your site for logo, colors, fonts and voice, and every drafted email uses it (docs).
- Free plan7 out of 105,000 emails up front, then 500 every month, no card and no expiry (pricing).
- Price8.5 out of 10$20 a month for 20,000 emails on Starter and $650 for a million emails on Scale including overage, with unlimited contacts on every plan (pricing).
- Developer tools10 out of 10REST API with an OpenAPI spec, a typed TypeScript SDK, a CLI, an MCP server, signed event webhooks, idempotent sends and test sends (docs).
- Track record and support4 out of 10A young product from a small team. Dedicated IPs available as a provisioned add-on on Scale or Enterprise, a 99.9% SLA only on Enterprise (pricing).
Nitrosend
Ask your agent for the next campaign
Connect Nitrosend to Claude, ChatGPT, Cursor or Codex, point Brand Kit at your site, and describe the email. Contacts are unlimited on every plan.
Free: 5,000 emails to start, then 500 a month. No credit card.
Start free
Rank 2Resend
77.5 out of 100Total
- Priced by
- Emails sent, plus contacts for marketing
- Free plan
- 3,000 emails a month, 100 a day
- Entry plan
- $20 a month, 50,000 emails
- Works from your AI assistant8 out of 10Hosted MCP server with OAuth, plus agent plugins and a CLI, but a person creates the account and verifies a domain (docs).
- Receipts and newsletters on one plan7 out of 10Broadcasts and automations share the account and API, but marketing is a second plan priced by contacts (pricing).
- Emails in your brand, no designer6 out of 10An AI writer in the editor with URL and brand analysis listed, and React Email for coded templates (pricing).
- Free plan8 out of 103,000 emails a month, up to 100 a day, on a free plan that does not expire (pricing).
- Price9 out of 10$20 a month for 20,000 emails on Pro, the same as Nitrosend, but $650 for a million on Scale (pricing).
- Developer tools9 out of 10Official SDKs, an SMTP relay, webhooks, inbound email, React Email and a CLI on every plan (pricing).
- Track record and support6 out of 10Newer than the incumbents, with SOC 2 Type II, dedicated IPs on Scale and a 99.99% SLA on Enterprise (pricing).
Rank 3Bird (formerly SparkPost)
76 out of 100Total
- Priced by
- Emails sent
- Free plan
- 1,000 emails a month, no expiry
- Entry plan
- $15 a month, 50,000 emails
- Works from your AI assistant8 out of 10Hosted MCP server at mcp.bird.com with OAuth and a CLI, and an agent can sign itself up from the terminal, but it must read an emailed code, and it can only test-send until a sending domain is verified (signup, sandbox).
- Receipts and newsletters on one plan7 out of 10Broadcasts and single sends draw on one email allowance and one bill, with no contact fee. Email automations are in early access, built in the dashboard, with a separate run allowance (automation).
- Emails in your brand, no designer4 out of 10Templates with versions and translations, and React Email rendering. You supply the design (product).
- Free plan6 out of 101,000 emails a month with no time limit and no card, capped at 50 a day (pricing).
- Price10 out of 10$15 a month for 20,000 emails on Startup, and $530 for a million on Growth (pricing).
- Developer tools9 out of 10SDKs for Node, Python, PHP and Go, an SMTP relay, event webhooks, inbound relay webhooks, suppression and a sandbox (API).
- Track record and support7 out of 10SparkPost infrastructure since 2014, now sold as Bird. Dedicated IPs $24.95 each on Growth and above. No SLA on the pricing page (pricing).
Rank 4Mailtrap
74 out of 100Total
- Priced by
- Emails sent, plus contacts for marketing
- Free plan
- 4,000 emails a month, 150 a day
- Entry plan
- $15 a month, 10,000 emails
- Works from your AI assistant6 out of 10Official MCP server, CLI and agent skills, run with an API token after a person signs up (docs).
- Receipts and newsletters on one plan7 out of 10Campaigns, contacts and automations sit in the same platform, on a second plan priced by contacts (pricing).
- Emails in your brand, no designer5 out of 10A drag-and-drop and HTML template builder with Handlebars, but the brand design is yours to build (docs).
- Free plan8 out of 104,000 emails a month, up to 150 a day, on a free plan with one sending domain (pricing).
- Price9 out of 10$20 a month for 20,000 emails on Basic, which covers 50,000, and $750 for the Enterprise 1.5 million step, since Business stops at 750,000 (pricing).
- Developer tools10 out of 10SDK guides for ten languages, SMTP, webhooks, inbound email, a CLI and a full email testing sandbox (docs).
- Track record and support7 out of 10Grew out of its email testing product. A dedicated IP on Business, a separate bulk stream and reputation alerts (pricing).
Rank 5Mailgun
67.5 out of 100Total
- Priced by
- Emails sent
- Free plan
- 100 emails a day
- Entry plan
- $15 a month, 10,000 emails
- Works from your AI assistant6 out of 10Official MCP server for sends, analytics and validation, run locally with an API key. Mailgun offers no hosted version (docs).
- Receipts and newsletters on one plan4 out of 10Mailing lists and a template builder on the sending API, but no campaign builder or automation flows (pricing).
- Emails in your brand, no designer5 out of 10An email template builder and templates API, but the brand design is yours to build (pricing).
- Free plan7 out of 10A free plan of 100 emails a day, one sending domain and one inbound route (pricing).
- Price8 out of 10$33 a month for 20,000 emails on Basic with overage, and $700 for a million on Scale (pricing).
- Developer tools9 out of 10Official SDKs in six languages, SMTP relay, webhooks, inbound routes and a validation API (docs).
- Track record and support9 out of 10A long-running sending API, now part of Sinch, with dedicated IP pools, IP warm-up and an uptime SLA (pricing).
Rank 6Amazon SES
65.5 out of 100Total
- Priced by
- Emails sent
- Free plan
- None. New AWS customers get up to $200 in credits
- Entry price
- $0.10 per 1,000 emails, or $0.16 on Essentials
- Works from your AI assistant7 out of 10AWS's own managed MCP server runs SES API calls, so an agent can send and read sending data, but it connects with IAM credentials a person sets up, and new accounts start in the SES sandbox (AWS).
- Receipts and newsletters on one plan3 out of 10A sending service with contact lists and subscription management, but no campaign builder or automation flows (pricing).
- Emails in your brand, no designer2 out of 10Stored templates are HTML and text you write yourself. There is no visual editor and no brand setup (pricing).
- Free plan4 out of 10No standing free plan. New AWS customers get up to $200 in Free Tier credits that apply to SES (pricing).
- Price10 out of 10Metered at $0.16 per 1,000 on Essentials, so $3.20 for 20,000 emails and $160 for a million (pricing).
- Developer tools9 out of 10AWS SDKs in every major language, SMTP, event publishing, inbound receiving and a mailbox simulator for tests (docs).
- Track record and support9 out of 10Running at Amazon scale since 2011, with managed dedicated IPs, Virtual Deliverability Manager and tenant isolation (pricing).
Rank 7Postmark
64.5 out of 100Total
- Priced by
- Emails sent
- Free plan
- 100 emails a month, no expiry
- Entry plan
- $15 a month, 10,000 emails
- Works from your AI assistant6 out of 10Official MCP server with 24 tools, run locally with a server token a person creates first (Postmark).
- Receipts and newsletters on one plan4 out of 10Broadcast streams send bulk mail from the same account, but there is no campaign builder or flows (docs).
- Emails in your brand, no designer5 out of 10A library of ready-made transactional templates, which you still edit into your own brand (Postmark).
- Free plan4 out of 10A free Developer plan of 100 emails a month that never expires, for testing (pricing).
- Price8 out of 10$29.50 a month for 20,000 emails on Pro with overage, and $775 on Basic for the 1.5 million step (pricing).
- Developer tools9 out of 10Official libraries for Node.js and TypeScript, Python, Ruby, .NET, Java and PHP, SMTP, delivery and bounce webhooks, and inbound processing (docs).
- Track record and support9 out of 10A transactional specialist since 2010, with separate streams, managed dedicated IPs and 45-day retention (pricing).
Rank 8SMTP2GO
60 out of 100Total
- Priced by
- Emails sent
- Free plan
- 1,000 emails a month
- Entry plan
- $15 a month, 10,000 emails
- Works from your AI assistant7 out of 10A hosted MCP server whose execute-request tool can call any API endpoint, sends included, with an API key a person creates (docs).
- Receipts and newsletters on one plan2 out of 10A sending service for SMTP and API mail, with no campaign builder or automation flows (pricing).
- Emails in your brand, no designer4 out of 10Stored templates through its app and API, but the design is yours to build (docs).
- Free plan6 out of 101,000 emails a month, free for as long as you like, with no credit card (pricing).
- Price9 out of 10$27 a month for 20,000 emails on Starter with overage, and $520 for a million on Professional (pricing).
- Developer tools6 out of 10SMTP relay, REST API, webhooks, templates and testing tools. No SDKs or inbound email in its developer docs (docs).
- Track record and support7 out of 10A dedicated IP on Professional, subaccounts, and ticket, chat and phone support on paid plans (pricing).
How they compare
How each one scores
Scores out of 10, September 25, 2026| What we compared | Nitrosend | Resend | Bird | Mailtrap | Mailgun | SES | Postmark | SMTP2GO |
|---|---|---|---|---|---|---|---|---|
| Works from your AI assistant25 points | 9 out of 10 | 8 out of 10 | 8 out of 10 | 6 out of 10 | 6 out of 10 | 7 out of 10 | 6 out of 10 | 7 out of 10 |
| Receipts and newsletters on one plan15 points | 9 out of 10 | 7 out of 10 | 7 out of 10 | 7 out of 10 | 4 out of 10 | 3 out of 10 | 4 out of 10 | 2 out of 10 |
| Emails in your brand, no designer10 points | 9 out of 10 | 6 out of 10 | 4 out of 10 | 5 out of 10 | 5 out of 10 | 2 out of 10 | 5 out of 10 | 4 out of 10 |
| Free plan10 points | 7 out of 10 | 8 out of 10 | 6 out of 10 | 8 out of 10 | 7 out of 10 | 4 out of 10 | 4 out of 10 | 6 out of 10 |
| Price15 points | 8.5 out of 10 | 9 out of 10 | 10 out of 10 | 9 out of 10 | 8 out of 10 | 10 out of 10 | 8 out of 10 | 9 out of 10 |
| Developer tools15 points | 10 out of 10 | 9 out of 10 | 9 out of 10 | 10 out of 10 | 9 out of 10 | 9 out of 10 | 9 out of 10 | 6 out of 10 |
| Track record and support10 points | 4 out of 10 | 6 out of 10 | 7 out of 10 | 7 out of 10 | 9 out of 10 | 9 out of 10 | 9 out of 10 | 7 out of 10 |
| Total scoreout of 100 | 83.75 out of 100,1st | 77.5 out of 100,2nd | 76 out of 100,3rd | 74 out of 100,4th | 67.5 out of 100,5th | 65.5 out of 100,6th | 64.5 out of 100,7th | 60 out of 100,8th |
Here are the seven yes-or-no questions developers usually ask before they pick one of these services. A tick means the service does it, as described on its own pages today. A dash means the answer is not a clean yes or no.
8 services, side by side
Checked September 25, 2026QuestionNitrosendResendBirdMailtrapMailgunSESPostmarkSMTP2GO
NitrosendResendBirdMailtrapMailgunSESPostmarkSMTP2GOSend from the chatCan an agent send a transactional email without anyone opening the web app?Nitrosend: Yes.Resend: Yes.Bird: Yes.Mailtrap: Yes.Mailgun: Yes.SES: Not a yes or no.Postmark: Yes.SMTP2GO: Yes.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes, through the MCP server. A single transactional email sends on the call; campaigns and flows stay drafts until approved. |
| Resend | Yes. Yes, once a person has created the account and verified a sending domain. |
| Bird | Yes. Yes, through the hosted MCP server once the workspace exists. Emailing customers needs a verified sending domain. |
| Mailtrap | Yes. Yes, once a person has signed up and handed the MCP server an API token. |
| Mailgun | Yes. Yes, once a person has created the account and handed the MCP server an API key. |
| SES | Not a yes or no. Only through a sample or general AWS MCP server, with AWS credentials a person sets up. |
| Postmark | Yes. Yes, once a person has set up the account and handed the MCP server a server token. |
| SMTP2GO | Yes. Yes, through its MCP server once a person adds an API key. |
Hosted MCP serverCan a chat app connect over the web, with no local install?Nitrosend: Yes.Resend: Yes.Bird: Yes.Mailtrap: No.Mailgun: No.SES: No.Postmark: No.SMTP2GO: Yes.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes. A remote server at api.nitrosend.com/mcp, with OAuth sign-in. |
| Resend | Yes. Yes. A remote server at mcp.resend.com/mcp, with OAuth sign-in. |
| Bird | Yes. Yes. mcp.bird.com, with OAuth sign-in. |
| Mailtrap | No. No. The official server runs locally through npx, or as a Claude Desktop extension. |
| Mailgun | No. No. Mailgun's docs say the server runs locally and no hosted version exists. |
| SES | No. No hosted SES MCP server. |
| Postmark | No. No. The official server runs locally through npx with an API token. |
| SMTP2GO | Yes. Yes. A remote server at developers.smtp2go.com/mcp, with an API key header. |
Sign up with no personCan an agent create the account and send a first email with no DNS work?Nitrosend: Yes.Resend: No.Bird: Not a yes or no.Mailtrap: No.Mailgun: No.SES: No.Postmark: No.SMTP2GO: No.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes. Signup is an API call, and each brand gets a ready sender on a Nitrosend subdomain. |
| Resend | No. No. Resend's own agent guide says a person must create the account. |
| Bird | Not a yes or no. An agent can sign itself up through the CLI or the API, but it must read the emailed sign-in code, and until a sending domain is verified it can send only to sandbox addresses and its own workspace members. |
| Mailtrap | No. No. Mailtrap's agent guide says a person signs up first. |
| Mailgun | No. No. A person signs up and verifies a sending domain first. |
| SES | No. No. A person opens the AWS account, verifies a domain and requests production access. |
| Postmark | No. No. A person signs up and confirms a sender signature or domain first. |
| SMTP2GO | No. No. A person signs up and verifies a sender domain first. |
Campaigns and flows in the same planDo newsletters and automations come with the transactional plan?Nitrosend: Yes.Resend: Not a yes or no.Bird: Not a yes or no.Mailtrap: Not a yes or no.Mailgun: No.SES: No.Postmark: Not a yes or no.SMTP2GO: No.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes, on every plan including Free. |
| Resend | Not a yes or no. Broadcasts and automations are in the same account, on a separate marketing plan. |
| Bird | Not a yes or no. Broadcasts share the email allowance. Email automations are in early access, with a separate run allowance. |
| Mailtrap | Not a yes or no. In the same platform, on a separate Email Marketing plan priced by contacts. |
| Mailgun | No. No. Mailing lists and templates, but no campaign builder or flows. |
| SES | No. No. SES sends, and the campaigns and flows are yours to build. |
| Postmark | Not a yes or no. Broadcast streams handle bulk sends. There is no campaign builder or automation flows. |
| SMTP2GO | No. No. Sending only. |
Perpetual free planIs there a free plan that does not run out?Nitrosend: Yes.Resend: Yes.Bird: Yes.Mailtrap: Yes.Mailgun: Yes.SES: No.Postmark: Yes.SMTP2GO: Yes.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes. 5,000 emails up front, then 500 a month. |
| Resend | Yes. Yes. 3,000 emails a month, 100 a day. |
| Bird | Yes. Yes. 1,000 emails a month, no time limit. |
| Mailtrap | Yes. Yes. 4,000 emails a month, 150 a day. |
| Mailgun | Yes. Yes. 100 emails a day. |
| SES | No. No. Up to $200 in AWS credits for new customers. |
| Postmark | Yes. Yes. 100 emails a month on the Developer plan, with no expiry. |
| SMTP2GO | Yes. Yes. 1,000 emails a month. |
Brand learned from your siteDoes it pick up your logo, colors, fonts and voice without a designer?Nitrosend: Yes.Resend: Not a yes or no.Bird: No.Mailtrap: No.Mailgun: No.SES: No.Postmark: No.SMTP2GO: No.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes. Brand Kit scans your site, and AI Memory keeps house style. |
| Resend | Not a yes or no. Its AI features list URL and brand analysis, which its docs do not describe yet. |
| Bird | No. No. Templates and React Email, and you supply the design. |
| Mailtrap | No. No. Templates are built in its editor or in HTML. |
| Mailgun | No. No. Templates are built in its builder or in HTML. |
| SES | No. No. Templates are HTML you write. |
| Postmark | No. No. A template library you edit into your own brand. |
| SMTP2GO | No. No. Templates are yours to build. |
Inbound emailCan it receive and parse email sent to your domain?Nitrosend: Yes.Resend: Yes.Bird: Yes.Mailtrap: Yes.Mailgun: Yes.SES: Yes.Postmark: Yes.SMTP2GO: No.
| Service | Answer |
|---|---|
| Nitrosend | Yes. Yes. An agent inbox on your own domain posts incoming mail to your webhook. |
| Resend | Yes. Yes, on every plan. |
| Bird | Yes. Yes. Inbound domains and relay webhooks. |
| Mailtrap | Yes. Yes. Mailtrap Inbound Email receives mail and exposes it over the API. |
| Mailgun | Yes. Yes, through inbound routes. |
| SES | Yes. Yes. SES receives mail through receipt rules and Mail Manager. |
| Postmark | Yes. Yes, with inbound processing on Pro and Platform. |
| SMTP2GO | No. No inbound email in its developer docs. |
Yes answersOut of the questions that have a yes or no for that service7 of 7 yes for Nitrosend4 of 5 yes for Resend4 of 5 yes for Bird3 of 6 yes for Mailtrap3 of 7 yes for Mailgun1 of 6 yes for SES3 of 6 yes for Postmark3 of 7 yes for SMTP2GO
At a glance
8 services, the same 7 tests, 100 points in all. In order: Nitrosend 83.75, Resend 77.5, Bird 76, Mailtrap 74, Mailgun 67.5, SES 65.5, Postmark 64.5, SMTP2GO 60. Nitrosend has the best score on Works from your AI assistant, Receipts and newsletters on one plan, Emails in your brand, no designer and Developer tools. Every price and feature was read on each company's own pages on September 25, 2026.
When another service is the better pick
Nitrosend does not win every test. Read these before you choose it.
- Pick Resend if you only send transactional email from application code. It scores 9 on developer tools, with official SDKs across languages, an SMTP relay, inbound email and React Email on every plan, per Resend's pricing page. It also scores higher on free plan and on track record.
- Pick Bird if the first $5 a month matters. It is $15 a month for 20,000 emails on Bird's Startup plan, against Nitrosend's $20, though $530 for a million against Nitrosend's $650. It matches Resend on developer tools, and it runs a hosted MCP server with OAuth sign-in. Bird's signup guide for agents has an agent create the account from its CLI, though someone still has to read the six-digit code Bird emails, and until a sending domain is verified it can send only to sandbox addresses and its own workspace members.
- Pick Mailtrap if you want a testing sandbox and production sending under one login. It scores 10 on developer tools, level with Nitrosend, with SDK guides for ten languages, SMTP, webhooks, inbound email, a CLI and a full email testing sandbox. Its free plan is 4,000 emails a month, up to 150 a day.
- Pick Amazon SES if the lowest bill is all that matters. It is $3.20 for 20,000 emails and $160 for a million on the Essentials plan, which earns it a 10 on price. The catch is that SES is a sending service rather than a product, with no campaign builder or automation flows, and a person opens the AWS account, verifies a domain and requests production access before mail reaches anyone outside a sandbox.
- Pick Postmark, Mailgun or Amazon SES if track record comes first. Each scores a 9 on track record and support, for years of transactional sending at scale, dedicated IPs, separate streams and published uptime commitments. Postmark puts transactional and broadcast mail on separate message streams with separate IP pools, so a newsletter never shares a path with a password reset, and that separation is why its delivery times are what they are. If Postmark is the one you are weighing, the Postmark alternatives review covers the other side of that trade.
- Pick SMTP2GO if you want a plain relay with people on the phone. It offers an SMTP relay, a REST API and webhooks, with ticket, chat and phone support on paid plans, and it is $520 for a million emails, below Nitrosend at $650.
Brevo, which bundles campaigns with transactional sending, is ranked on the Brevo alternatives page rather than here, because this review scores sending services on the same seven tests.
What each one costs in 2026
Every service here charges by emails sent, except Amazon SES, which is metered at $0.10 per 1,000 a la carte or $0.16 per 1,000 on the Essentials plan that new accounts default to. SendGrid itself bills its Email API on a send-volume slider and Marketing Campaigns on stored contacts, so if you want both you pay twice, on two different units. Its Email API is $19.95 a month on Essentials at 20,000 emails, and the Pro 1.5 million step that covers a million is $799.
What sending costs
List prices, USD, monthly, September 26, 2026| Service | 20,000 emails a month | 1,000,000 emails a month |
|---|---|---|
| Nitrosend (pricing page) | $20Starter, contacts unlimited | $650Scale, contacts unlimited, including overage |
| Resend (pricing page) | $20Pro, which covers 50,000 | $650Scale |
| Bird (pricing page) | $15Startup, which covers 50,000 | $530Growth |
| Mailtrap (pricing page) | $20Basic, which covers 50,000 | $750Enterprise, the 1,500,000 plan. Business stops at 750,000 for $450 |
| Mailgun (pricing page) | $33Basic, 10,000 included and $1.80 per 1,000 after | $700Scale |
| SES (pricing page) | $3.20Lowest. Essentials, the default for a new account, or $2 a la carte. Charged per email | $160Lowest. Essentials, the default for a new account, or $100 a la carte. Charged per email |
| Postmark (pricing page) | $29.50Pro, 10,000 included and $1.30 per 1,000 after. Basic is $33 | $775Basic, the 1,500,000 plan. Pro is $852.50 |
| SMTP2GO (pricing page) | $27Starter, 10,000 included and $1.20 per 1,000 after | $520Professional |
At 20,000 emails a month, where most teams start, Nitrosend is $20. That is the same as Resend and Mailtrap, and within $5 of Bird at $15. SMTP2GO, Postmark and Mailgun charge for every email past 10,000, which puts them at $27 to $33.
At a million emails a month, Nitrosend is $650. SMTP2GO is $520, Bird $530, Resend $650, Mailgun $700, Mailtrap $750 and Postmark $775. With Amazon SES the campaign builder, the flows and the email design are yours to build.
The bigger difference is what the $20 buys. Nitrosend's own developer page puts it plainly: most email APIs stop at "send a message", and Nitrosend provides the entire stack through the same key, lists, segments, automated flows, brands, templates and deliverability, alongside a single-call transactional send. That is the half SendGrid sells as Marketing Campaigns. If you pay SendGrid for both today, add the two bills together before you compare.
How we scored
Every service gets a score out of 10 on the same seven tests. Each test is worth a set number of points, 100 in all. Working from your AI assistant is worth the most, 25 points, because that is where email is heading. Price, developer tools and track record, where the older services are strongest, share 40 points, so a service that is better there gets full credit for it. SendGrid itself is not ranked on its own alternatives page. Its score against Nitrosend on the same tests is on Nitrosend vs SendGrid.
Each test is a question with one answer per service, checked against the service's own pages on September 25, 2026. A 10 means it does the job fully on its normal plans. A 5 means it does part of it, or only on a higher plan or in a second product.
Works from your AI assistant, 25 points. Can an agent inside Claude, ChatGPT, Cursor or Codex go from nothing to a delivered transactional email, and then read back what happened to it, with no person opening the web app along the way? Scored on the first-party MCP server and what its tools cover, a CLI that works in a non-interactive runner, account and sender setup over the API, and listings in the chat apps people already work in. Scored on one written rule for every vendor: a first-party server the vendor runs and that can send counts fully; a third-party wrapper (Zapier, Composio, Kanopi, community servers) counts for less; a server that only drafts or reads counts for less than one that sends.
Receipts and newsletters on one plan, 15 points. Can receipts and password resets, and the newsletters and automated flows that follow them, go out from one account, on one bill, through one API, with the two streams kept apart?
Emails in your brand, no designer, 10 points. Does the product produce the receipt, reset and welcome emails in your brand's own logo, colors, fonts and voice, or does a developer have to write or buy the HTML template first?
Free plan, 10 points. How far can a developer get on the free plan before paying: the monthly volume, the daily ceiling, any one-off starter allowance, and whether the plan is perpetual or a trial that ends.
Price, 15 points. What does sending cost at 20,000 emails a month, where most teams start, and at 1,000,000, where a busy product ends up? Scored on list prices in US dollars, paid monthly, at the cheapest plan that covers the volume. Every ranking on this site uses the same fixed scale. At 20,000 emails, $20 or less scores 10, then $25 scores 9, $32 scores 8, $40 scores 7, $50 scores 6, $70 scores 5, $100 scores 4 and $140 scores 3. At 1,000,000, $500 or less scores 10, then $625, $800, $1,000, $1,250, $1,750, $2,500 and $3,500 step down the same way. Anything dearer, or a price given only by quote, scores 2. The score is the average of the two.
Developer tools, 15 points. How complete is what a developer builds on: a REST API with an OpenAPI spec, official SDKs across languages, a CLI, an SMTP relay, documented delivery-event webhooks, idempotent sends, a test or sandbox mode, inbound email handling, and how deep the reference docs go?
Track record and support, 10 points. How long has it run transactional sending at scale, which deliverability controls can you own (dedicated IPs, suppression, separate streams, a published uptime SLA), and what support comes with the plan?
One thing is not scored: inbox placement. No two of these services publish a comparable deliverability number, so a score there would be a guess dressed up as a measurement.
SendGrid, Mailgun and Postmark are reliable, and their uptime is not in question. They were built for application code that already knows what to send, before anyone expected software to compose the message as well as deliver it, and SendGrid's agent tooling still shows it. Twilio's MCP server is a public beta that needs no account and is read-only: it searches API documentation and does not execute API calls, and the tools that would let an agent call Twilio's APIs over OAuth are listed as planned. That gap, not delivery, is what the 25-point test measures.
When to keep SendGrid and when to replace it
Keep it when the sending is doing its job. SendGrid has been delivering mail since it was founded in 2009, it does inbound parsing and event webhooks (SendGrid docs), and if your reputation is already built on it, moving that reputation is a cost with no upside.
Replace it when the shape of the product is the problem rather than the delivery. Five things work against SendGrid customers, all five in Twilio's own documents.
- Two products, two meters. The Email API and Marketing Campaigns are sold and billed separately under one login. The API is priced on sends. Marketing Campaigns is priced on stored contacts, Basic starting at $15 a month and Advanced at $60, checked October 1, 2026. A large list you rarely email costs you on one meter while your receipts cost you on the other.
- Paying for mail that never leaves. Twilio's suppressions documentation says each email you attempt to send to a suppressed address consumes one credit. A script or an agent that keeps retrying an old list pays for every address SendGrid has already refused, so ask any provider you move to whether a suppressed send counts against your allowance.
- Billing during a suspension. Twilio's account review documentation says an account in a suspended state continues to incur auto-renewal billing for the monthly subscription and for Marketing Campaigns contact storage. A banned account stops auto-renewing but is still charged for overages and contact storage for the current month.
- No free tier. Twilio began retiring the free Email API and Marketing Campaigns plans on May 27, 2025, with 60 days' notice, after which sending paused on free accounts and the Marketing Campaigns templates, contact lists and automation went with it. What is left is a 60-day trial at 100 emails a day.
- A new owner's roadmap. sendgrid.com now redirects to SendGrid's page on twilio.com, one product among Twilio's. None of that changes deliverability. It does change who decides what gets built next.
People rarely leave SendGrid because the mail stopped arriving. They leave because the second product costs as much as the first, or because nothing in the account can be run by the software they already use.
George Hartley, Nitrosend's co-founder, thinks that second reason only grows. On The Breakout CEO in August 2026 he said: "I think everyone at some point will switch to running whatever they're doing from an agent is just so, so much, such a better way to administer and grow a company in a website." A month later on X he quoted the line "Soon there will be 100 Billion agents" and added: "I think it undershot this by a factor of 10." If your team already works from an assistant, weigh how much of SendGrid it can drive before you weigh the price.
Can I keep SendGrid and move only the campaigns?
Yes, and for most teams it is the lower-risk move. Your sending reputation lives on the domain and the IP pool you have been warming, so leaving it in place while you change the tools above it removes the scariest variable. On a paid Nitrosend plan you add your SendGrid API key as the sending provider, and Nitrosend handles composition, audiences, automation, tracking and suppression while SendGrid carries the mail, as the email providers documentation describes. Two details catch people out, both on the SendGrid integration page. A key with only the Mail Send permission passes the connection test but cannot finish sending-domain setup, because that step uses SendGrid's Sender Authentication and Inbound Parse APIs, so use a Full Access key or a restricted key with all three. And rotating the key later resets that integration's verified domains to pending until you verify them again, so rotate on a quiet day. When you want to move the sending too, you switch the integration and warm the new path deliberately. The bring-your-own sending keys page has the mechanics.
What happens to my templates, webhooks and suppression list?
Templates move, but not automatically. Dynamic template syntax is specific to each provider, so budget for rebuilding the handful you actually send rather than porting all of them. Webhook event names differ between providers, so map them before you cut over. How webhooks work covers the pattern.
The suppression list is the one people forget, and in SendGrid it is five lists, not one. Twilio's suppressions documentation keeps bounces, invalid emails, spam reports, global unsubscribes and group unsubscribes, and does not keep suppressing blocks, which relate to your IP or content rather than the address. Export all five and import them on day one. Group unsubscribes are per topic, so decide before the import whether each group becomes a list or a full opt-out. A clean start that mails 4,000 known-bad addresses again is how a new domain gets blocked in a week, and your email bounce rate is the number that shows it first.
How to move off SendGrid without losing deliverability
Swapping the code takes an afternoon. The reputation takes weeks.
- Export before you change anything. Take your suppression list, your contacts and your sending history. Bounces and complaints are the part you cannot rebuild.
- Authenticate the new sender. Add it to your domain, with both senders present in one SPF record for the overlap. The email authentication page has the records, including getting
p=quarantineright on DMARC. - Split by message type. Move one low-risk stream first, a receipt or a password reset, and watch it for a week, rather than splitting by percentage.
- Warm the new path. Do not cut over in one send. How to warm up an email domain has the ramp, and it is slower than you want it to be.
- Test placement before the volume moves. Run an inbox placement test, then watch bounce and complaint rates daily for the first month.
- Keep the old account for 30 days. Keep it open and paid until the new path has held. Rolling back is only cheap if you did not cancel.
For the mechanics of the sending path itself, the email API hub covers what happens between your POST and the recipient's mail server.
SendGrid alternatives FAQ
Nitrosend, with the top score in this review, 83.75 out of 100. It is the only service here where an AI assistant can create the account, get a ready sender and make the first send without a person verifying a domain, and receipts, campaigns and flows run on one plan from $20 a month. Pick Resend if you only send transactional email from application code and want SDKs in many languages and an SMTP relay. Amazon SES suits a team already in AWS that is happy to build the missing pieces.
No. Twilio started retiring the free plans on May 27, 2025 with a 60-day transition, and what replaced them is a 60-day trial at 100 emails a day. Among the options here, Nitrosend gives 5,000 emails to start, then 500 a month, with full API, MCP and CLI access on the free plan. Mailtrap is free to 4,000 emails a month, Resend to 3,000 a month with a 100 a day cap, and Bird and SMTP2GO to 1,000 a month. Amazon SES offers new AWS customers up to $200 in Free Tier credits rather than a free plan.
Twilio's account review documentation says a suspended account continues to incur auto-renewal billing for the monthly subscription and for Marketing Campaigns contact storage. A banned account stops auto-renewing but is still charged for overages and contact storage in the current month. Check your own account state and renewal date before you assume sending has stopped the meter.
Not one that sends. Twilio's MCP server is a public beta and read-only: it searches API documentation, SendGrid's included, and does not execute API calls, and the SendGrid servers on the official MCP registry are community built. Among the alternatives here, Nitrosend scores 9 out of 10 on working from your AI assistant, because its official MCP server lets an agent sign up, get a ready sender and send with no dashboard. Resend scores 8 with a hosted MCP server and OAuth sign-in, but Resend's agent onboarding guide has a person add the DNS records that verify a domain before anything sends. Bird also scores 8, and an agent can sign up through its CLI, but someone has to read an emailed code, and it can only test-send until a sending domain is verified. Amazon SES scores 7 through AWS's own managed MCP server, on IAM credentials a person sets up. The full SendGrid side is on Nitrosend vs SendGrid, head to head.
Yes, for the addresses you set up as inboxes. Nitrosend has an Agent Inbox that posts incoming mail to your own endpoint, and an AI agent can read and reply over MCP. Mail it quarantines as spam, a virus or a blocked sender is not posted. If your application receives mail at addresses you cannot set up in advance, keep SendGrid, Mailgun or Postmark for that part. Transactional email, defined covers what each stream carries.
Add Nitrosend's MCP server at api.nitrosend.com/mcp to Claude, or to ChatGPT, Cursor or Codex, and sign in with OAuth. Then ask for the email in plain words. A transactional message such as a receipt goes out on the call, and a campaign or flow is built as a draft that waits until it is approved. If you want SendGrid to keep carrying the mail while you switch, connect your SendGrid key on a paid plan and Nitrosend sends through it. The MCP documentation lists the tools.
Setup is an afternoon. Reputation is a month. Anyone quoting a same-day migration at scale has not done one. If you are weighing Mailtrap as well, the Mailtrap alternatives review ranks the services that replace it for sending.
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Other alternatives lists