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 Mailtrap alternative for teams that send email from an AI agent, with the top score of 83.75 out of 100. To send email from an AI agent with Nitrosend, connect its MCP server at api.nitrosend.com/mcp in 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 assistant can even create the account and send from a ready sender on a Nitrosend subdomain, with no DNS to set up and no dashboard to open, as the agent onboarding guide shows, which is why it scores 9 out of 10 on working from your AI assistant, the test worth the most points. Your receipts and your newsletters go out on one plan and one bill, where Mailtrap sells Email Marketing as a second plan priced by contacts. It writes every email in your brand's colors, fonts and voice. And it costs $20 a month for 20,000 emails, the same as Mailtrap's Basic plan, and $650 for a million emails on Scale including overage, where Mailtrap is $750. Resend comes next at 77.5, then Bird (formerly SparkPost) at 76.
If you only use Mailtrap to catch the email your application sends in development, you want a testing tool, and this ranking is not about that job. Mailtrap's own Email Sandbox does it well, as a separate product from its sending API, and its mail never reaches your users. The free option is Mailpit, a single open-source binary or Docker image you run on your own machine or test server. It acts as the SMTP server, keeps every message it receives and shows it in a web inbox, with an API for integration tests. The free email testing guide covers the wider set.
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 4MailerSend
68.5 out of 100Total
- Priced by
- Emails sent
- Free plan
- 500 emails a month, card required
- Entry plan
- $7 a month, 5,000 emails (Hobby)
- Works from your AI assistant8 out of 10Hosted MCP server connected by OAuth that sends and schedules email, sets up domains and webhooks and reads email activity, once a person has signed up (docs).
- Receipts and newsletters on one plan4 out of 10Bulk emailing through the same API, but no campaign builder, segments or automation flows (pricing).
- Emails in your brand, no designer6 out of 10Drag-and-drop, HTML and rich-text builders with ready-made templates, which you still set up in your brand (pricing).
- Free plan5 out of 10A Free plan of 500 emails a month with 100 API requests a day, and a card on file (pricing).
- Price8 out of 10$35 a month for 20,000 emails on Starter, which covers 50,000, and $600 for a million on Starter (pricing).
- Developer tools9 out of 10Seven SDKs, an OpenAPI collection, SMTP relay, webhooks, inbound routing and testing features (pricing).
- Track record and support6 out of 10A 99.5% uptime SLA on its top plans, with dedicated IPs on Enterprise above 100,000 emails a week (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 8SendGrid
59.5 out of 100Total
- Priced by
- Emails sent (Email API)
- Free plan
- Trial: 100 a day for 60 days
- Entry plan
- $19.95 a month, 50,000 emails
- Works from your AI assistant3 out of 10No first-party SendGrid MCP server. Twilio's beta MCP server searches API docs and does not send (Twilio).
- Receipts and newsletters on one plan6 out of 10Marketing Campaigns is a separate product with its own plan, priced on contacts stored (Twilio).
- Emails in your brand, no designer5 out of 10Dynamic templates, a design editor and a Designs API, but the design is yours to build (docs).
- Free plan3 out of 10A trial, not a plan: 100 emails a day for 60 days, then pay (pricing).
- Price9 out of 10$19.95 a month for 20,000 emails on Essentials, and $799 for the Pro 1.5 million step (pricing).
- Developer tools9 out of 10SDKs in seven languages, SMTP relay, event webhooks, Inbound Parse and a sandbox mode (docs).
- Track record and support8 out of 10Sending since 2009, owned by Twilio since 2019, dedicated IPs included on Pro (pricing).
How they compare
How each one scores
Scores out of 10, September 25, 2026| What we compared | Nitrosend | Resend | Bird | MailerSend | Mailgun | SES | Postmark | SendGrid |
|---|---|---|---|---|---|---|---|---|
| Works from your AI assistant25 points | 9 out of 10 | 8 out of 10 | 8 out of 10 | 8 out of 10 | 6 out of 10 | 7 out of 10 | 6 out of 10 | 3 out of 10 |
| Receipts and newsletters on one plan15 points | 9 out of 10 | 7 out of 10 | 7 out of 10 | 4 out of 10 | 4 out of 10 | 3 out of 10 | 4 out of 10 | 6 out of 10 |
| Emails in your brand, no designer10 points | 9 out of 10 | 6 out of 10 | 4 out of 10 | 6 out of 10 | 5 out of 10 | 2 out of 10 | 5 out of 10 | 5 out of 10 |
| Free plan10 points | 7 out of 10 | 8 out of 10 | 6 out of 10 | 5 out of 10 | 7 out of 10 | 4 out of 10 | 4 out of 10 | 3 out of 10 |
| Price15 points | 8.5 out of 10 | 9 out of 10 | 10 out of 10 | 8 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 | 9 out of 10 | 9 out of 10 | 9 out of 10 | 9 out of 10 | 9 out of 10 |
| Track record and support10 points | 4 out of 10 | 6 out of 10 | 7 out of 10 | 6 out of 10 | 9 out of 10 | 9 out of 10 | 9 out of 10 | 8 out of 10 |
| Total scoreout of 100 | 83.75 out of 100,1st | 77.5 out of 100,2nd | 76 out of 100,3rd | 68.5 out of 100,4th | 67.5 out of 100,5th | 65.5 out of 100,6th | 64.5 out of 100,7th | 59.5 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, 2026QuestionNitrosendResendBirdMailerSendMailgunSESPostmarkSendGrid
NitrosendResendBirdMailerSendMailgunSESPostmarkSendGridSend from the chatCan an agent send a transactional email without anyone opening the web app?Nitrosend: Yes.Resend: Yes.Bird: Yes.MailerSend: Yes.Mailgun: Yes.SES: Not a yes or no.Postmark: Yes.SendGrid: Not a yes or no.
| 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. |
| MailerSend | Yes. Yes, once a person has signed up and authorized the MCP connection. |
| 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. |
| SendGrid | Not a yes or no. Only by writing code against the API. Twilio's own MCP server searches the docs and does not send. |
Hosted MCP serverCan a chat app connect over the web, with no local install?Nitrosend: Yes.Resend: Yes.Bird: Yes.MailerSend: Yes.Mailgun: No.SES: No.Postmark: No.SendGrid: No.
| 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. |
| MailerSend | Yes. Yes. Connect by URL and authorize access to the account. |
| 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. |
| SendGrid | No. No. Every SendGrid server on the official MCP registry is community built, none hosted by Twilio. |
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.MailerSend: No.Mailgun: No.SES: No.Postmark: No.SendGrid: 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. |
| MailerSend | No. No. A person signs up, with a card even on Free, and verifies a domain. |
| 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. |
| SendGrid | No. No. A sender or a domain has to be verified before real sending. |
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.MailerSend: No.Mailgun: No.SES: No.Postmark: Not a yes or no.SendGrid: 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. |
| MailerSend | No. No. Bulk emailing, but no campaign builder or flows. |
| 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. |
| SendGrid | No. No. Marketing Campaigns is a separate plan, from $15 a month. |
Perpetual free planIs there a free plan that does not run out?Nitrosend: Yes.Resend: Yes.Bird: Yes.MailerSend: Yes.Mailgun: Yes.SES: No.Postmark: Yes.SendGrid: No.
| 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. |
| MailerSend | Yes. Yes. 500 emails a month. |
| 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. |
| SendGrid | No. No. 100 emails a day for 60 days, then a paid plan. |
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.MailerSend: No.Mailgun: No.SES: No.Postmark: No.SendGrid: 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. |
| MailerSend | No. No. Templates are built in its editors. |
| 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. |
| SendGrid | No. No. Templates and a design editor, but you supply the design. |
Inbound emailCan it receive and parse email sent to your domain?Nitrosend: Yes.Resend: Yes.Bird: Yes.MailerSend: Yes.Mailgun: Yes.SES: Yes.Postmark: Yes.SendGrid: Yes.
| 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. |
| MailerSend | Yes. Yes, through inbound routing. |
| 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. |
| SendGrid | Yes. Yes, with Inbound Parse. |
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 Bird4 of 7 yes for MailerSend3 of 7 yes for Mailgun1 of 6 yes for SES3 of 6 yes for Postmark1 of 6 yes for SendGrid
At a glance
8 services, the same 7 tests, 100 points in all. In order: Nitrosend 83.75, Resend 77.5, Bird 76, MailerSend 68.5, Mailgun 67.5, SES 65.5, Postmark 64.5, SendGrid 59.5. 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 SDKs from Node.js and Python to Go, Rust and .NET, an SMTP relay and inbound email. It also scores higher on free plan, 8 to 7, and on track record.
- Pick Bird if the first $5 a month matters. It is $15 a month for 20,000 emails, against Nitrosend's $20, though $530 for a million against Nitrosend's $650. It matches Resend on developer tools, and it hosts its own MCP server at mcp.bird.com with OAuth sign-in.
- Pick Postmark if a receipt is arriving late or landing in spam. It scores 9 on track record, as a transactional specialist that keeps transactional and broadcast mail on separate streams with their own IP pools and 45 days of data retention, and 9 on developer tools, with official libraries for Ruby, Python, .NET, Java, PHP and Node.js, and inbound processing.
- Pick Mailgun or Postmark if your application parses inbound mail. Both receive email and post it to your own endpoint, and Mailgun adds inbound routes and a validation API. Nitrosend's Agent Inbox posts mail to your webhook one address at a time, so keep one of them for that leg if you receive at addresses you cannot set up in advance.
- Pick MailerSend if a marketer edits the templates. It has drag-and-drop, HTML and rich-text builders, and seven SDKs, an SMTP relay and inbound routing behind them. It is $35 a month for 20,000 emails and $600 for a million.
- 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 Essentials, which earns it a 10 on price. The catch is that SES is infrastructure rather than a product. The templates, suppression handling and reporting are yours to build, and every new account starts in the SES sandbox until production access is requested and granted.
SendGrid scores 59.5 here, with a 60-day trial in place of a free plan, and the SendGrid alternatives review covers why teams leave it.
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. Mailtrap itself is $20 a month at 20,000 emails on Basic, which covers 50,000, and $750 for a million on the Enterprise plan for 1,500,000, because Business stops at 750,000 for $450.
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 |
| MailerSend (pricing page) | $35Starter, the first plan with 50 webhooks and 250 templates. Hobby with overage is $29.50 but has 1 webhook and 10 templates | $600Starter |
| 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 |
| SendGrid (pricing page) | $19.95Essentials, which covers 50,000 | $799Pro, the 1,500,000 plan. The 700,000 plan is $499 |
At 20,000 emails a month, where most teams start, Nitrosend is $20, the same as Resend and as Mailtrap's Basic plan. Postmark is $29.50, Mailgun $33 and MailerSend $35. Three cost less: SendGrid at $19.95, Bird at $15 and Amazon SES at $3.20.
At a million emails a month, Nitrosend is $650. Bird is $530, MailerSend $600, Resend $650, Mailgun $700, Postmark $775 and SendGrid $799. With Amazon SES the templates, unsubscribe handling and reporting 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 gives you the entire stack through the same key, lists, automation, segmentation, brand and deliverability, alongside a single-call transactional send. That is the half Mailtrap sells as Email Marketing, on its own plan priced by contacts. If you pay Mailtrap 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. The tests are for sending, so testing tools like Mailpit are not scored here. Mailtrap itself is not ranked on its own alternatives page. Its head-to-head with Nitrosend is on Nitrosend vs Mailtrap.
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.
Mailtrap's sending product is a real competitor, not a testing tool with a send button. It scores 10 on developer tools on the same tests, level with Nitrosend, with SDK guides for ten languages, SMTP, webhooks, inbound email and a CLI. Where the two differ is the check before a real send. Mailtrap checks a message by catching it in a sandbox, and its template debugging guide switches the call to separate sandbox credentials to do it, so the test proves the template, not the sending path. Nitrosend checks by sending: its test-send tool sends one real email for a template, campaign or exact flow revision and never approves or sends to an audience, and its API keys come in live and test-mode versions, nskey_live_ and nskey_test_.
When to keep Mailtrap and when to replace it
Keep it when you use the sandbox and the sending together. One login for the capture inbox in development and the sending API in production is a real convenience. Its free sending plan is 4,000 emails a month, up to 150 a day, and Business adds a dedicated IP.
Replace the sending half when the shape of the product is the problem rather than the delivery. Four things stand out, all from Mailtrap's own pages.
- A second plan for marketing. Campaigns, contacts and automations sit in the same platform, on a separate Email Marketing plan priced by contacts. Receipts are billed on sends and newsletters on list size.
- A person signs up first. Mailtrap has an official MCP server, a CLI and agent skills, but its AI onboarding guide says it requires a human to sign up and create the API token. The server's example setup also asks for a sender address, an account ID and a test inbox ID from the Mailtrap app, and it runs locally through npx or as a Claude Desktop extension, not hosted.
- A slow first hour. A new account is held to 150 emails an hour, and mail over the hourly limit is queued into the following hours, so a password reset sent in a busy hour waits. On the free plan, mail past 150 a day is rejected.
- The jump at volume. Basic is $20 for up to 50,000 emails, but Business stops at 750,000 for $450, so a million a month means the Enterprise plan for 1,500,000 at $750.
None of that says the mail stops arriving. Mailtrap is a Railsware product with more than 150,000 monthly active users, by its own count. Teams leave the sending half because the second product costs extra, or because the software they already use cannot run the account.
George Hartley, Nitrosend's co-founder, expects that second reason to become the main one. 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." Keep Mailtrap's sandbox if your team relies on it, and judge the sending side on what your assistant can run.
Can I keep Mailtrap for testing and move only the sending?
Yes, and it is a common split. Email Testing and the Email API are sold on independent plans, so you can keep the capture inbox pointed at your development environment and move production sending elsewhere. The alternative for the testing half is Mailpit, which is free and runs locally, and how to send a test email covers checking the real thing on an authenticated domain before each release.
What happens to my templates, webhooks and suppression list?
Look for two sending configurations, not one. Mailtrap requires its Bulk Stream for marketing and promotional mail, and the Bulk Stream has its own hosts, bulk.api.mailtrap.io and bulk.smtp.mailtrap.io, next to send.api.mailtrap.io and live.smtp.mailtrap.io for transactional mail. A codebase that sends both has both hostnames somewhere, often in different services, and the one missed in the cutover keeps sending through Mailtrap.
Templates move, but not automatically. Mailtrap's templates use Handlebars, and 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, and webhook testing covers checking the new endpoint.
The suppression list is the one people forget. Mailtrap exports the whole list, but an address appears once for every domain it was suppressed on, and each entry is tied to a stream, Bulk, Transactional or Any. Mailtrap keeps the streams apart so a newsletter unsubscribe does not stop receipts. Remove the duplicates, decide which entries block every message and which block only marketing, and import them on day one. A clean start that mails known-bad addresses again is how a new sender loses its reputation early, and your email bounce rate is the number that shows it first.
How to move off Mailtrap without losing deliverability
If you are only replacing the testing half, there is nothing to migrate. Change the SMTP host in your development configuration and close the testing plan. The steps below are for the sending half.
- 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. Mailtrap's own dedicated IP warm-up takes a new IP from 300 emails on day one to 57,000 on day 21, with anything over the day's limit sent through shared IPs, and a new provider needs a ramp of its own. How to warm up an email domain has the steps, and it is slower than you want it to be.
- Keep the old keys live for a week. Revoke them once a full week of traffic has run clean on the new provider. 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, and the transactional email hub covers keeping receipts and newsletters on separate streams.
Mailtrap alternatives FAQ
For sending, Nitrosend, with the top score in this review, 83.75 out of 100. An AI assistant can create the account, get a ready sender with no domain to verify and make the first send itself, and receipts, campaigns and flows run on one plan from $20 a month. Pick Resend if you only send transactional email from application code. For catching development email, use Mailpit or Mailtrap's own sandbox.
Mailpit, if the job is catching the email your application sends in development. It is free and open source, runs as a single binary or Docker image on your own machine or test server, and shows every captured message in a web inbox. Mailtrap's own Email Sandbox is the hosted option, sold separately from its sending API. The free email testing guide covers both.
Yes. Email API and SMTP is a separate product from the Email Sandbox, with its own transactional API, SMTP relay and inbound email, and a free plan of 4,000 emails a month, up to 150 a day. Email Marketing is a third product on its own plan priced by contacts.
For the sending half, yes: transactional email, campaigns, flows, contacts and templates in one account, with unlimited contacts on every plan, run from Claude, ChatGPT, Cursor or Codex over MCP. For catching development email in a local inbox, keep Mailtrap's sandbox or use Mailpit, which are built for that job.
Add the Nitrosend MCP server at api.nitrosend.com/mcp and sign in with OAuth. In Claude Code that is claude mcp add --transport http nitrosend https://api.nitrosend.com/mcp, and in Claude Desktop and Claude.ai it is the Nitrosend connector under Settings, Connectors, as the agent onboarding guide sets out. Ask Claude for a test send first: it sends one real email and never sends to an audience. A transactional email then goes out on the call, and a campaign or flow stays a draft until you approve it. There is no API token to copy out of a dashboard, which is the step Mailtrap's own guide leaves to a person.
Yes, once a person has set it up. Mailtrap has an official MCP server, a CLI and agent skills, but its AI onboarding guide says a person signs up and creates an API token before an assistant can send, and the server runs locally through npx or as a Claude Desktop extension rather than hosted. On Nitrosend the assistant creates the account, gets a ready sender and makes the first send itself, which is why it scores 9 out of 10 on working from your AI assistant, ahead of Resend, Bird and MailerSend at 8.
Not necessarily. A separate testing tool guarantees that development mail cannot reach a customer, at the cost of a second vendor and a second configuration to keep in sync. One provider with a test-send step and an approval before anything goes out gives a shorter setup and one place to look when something breaks. Teams with regulated data usually pick the first, and small teams shipping fast usually pick the second.
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