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Alternatives

Resend alternatives

Four email services a developer leaving Resend would actually consider, weighed on inbound mail, signed webhooks, agent tooling and what an extra thousand emails costs. Every figure was read from the vendor's own page on 2026-09-29.

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Resend
Resend is an email API with a dashboard, nine official SDKs and a documentation set written for agents as well as people; its transactional plans and its marketing plans are priced apart.
What this page is
A list of four email services that would take the mail Resend sends for you today, compared on the same rows and against the same sources. Rasket is one of them, and we build it — so every claim we make about ourselves is linked to a Rasket page, and every claim about anybody else is linked to theirs.

Key takeaways

  • Extra emails, per 1,000 — Rasket: $0.60. Resend: $0.90.
  • Transactional and campaigns on one plan — Rasket: Yes. Resend: Marketing email is priced as a separate plan.
  • Data retention — Rasket: 30 days on the self-serve plans. Resend: 30 days on the free plan.
  • Official SDKs — Rasket: Coming soon. Resend: Node.js, PHP, Python, Ruby, Go, Java, Rust, Elixir and .NET.

Why developers look for a Resend alternative

Three reasons that are rows of the table below rather than opinions. Each one is something Resend publishes about itself.

  • Extra emails cost $0.90 per thousand past the quota, where Rasket charges $0.60.
  • Marketing email is priced as a separate plan, so an audience and a password reset are two subscriptions.
  • The pricing page states a retention window for the free plan only, so what is kept on a paid plan is not something you can read before you buy.

None of those is a reason on its own. They are reasons if they describe what you are doing: a product past its free tier, a support conversation longer than the history you can read, a campaign you would rather not buy twice.

Four alternatives to Resend

Rasket is first because we build it, and you should read the table before you take our word for the order.

  1. 1.Rasket

    Yes, on the rows the table covers. Both send over a REST API and an SMTP relay, sign their webhooks, receive inbound mail and document themselves for agents. Rasket charges $0.60 per thousand extra emails against $0.90, and keeps campaigns on the same plan as transactional mail rather than pricing them separately. Resend has more SDK languages, so check that row before you move.

    Best for: Developers who want sending, receiving and campaigns behind one API key

  2. 2.SendGrid

    SendGrid is Twilio's email product: an API and an SMTP service with seven official libraries, sold as Email API plans, with its campaign tooling bought as a second subscription. Free plan: No free plan — a 60-day trial of 100 emails a day. Extra emails, per 1,000: $1.30.

    Best for: Teams already inside Twilio who want email on the same account

  3. 3.Postmark

    Postmark is a transactional email service with six official libraries, an SMTP option and Message Streams, which keep transactional and broadcast mail on separate sending infrastructure. Free plan: 100 emails a month, and it does not expire. Extra emails, per 1,000: $1.80.

    Best for: Teams who want transactional and bulk mail kept on separate streams

  4. 4.Mailgun

    Mailgun is an email API from Sinch with six official SDKs, an SMTP relay, rule-based inbound routing and signed webhooks, sold on plans whose log retention grows with the tier. Free plan: 100 emails a day. Extra emails, per 1,000: From $1.80 on Basic.

    Best for: Teams who route inbound mail with rules and want a relay in front of it

The four, row by row

The same rows for all four, with the source of every cell numbered at the foot of the page.

Four alternatives to Resend, compared row by row
CriterionRasketSendGridPostmarkMailgun
Sending and receiving
Inbound emailYes 1Receive at your own domain on every plan, delivered as a signed webhook.On the Pro and Premier plans 13The pricing table lists the Inbound Parse Webhook against Pro and Premier only.On the Pro and Platform plans 18The pricing table lists inbound email processing against Pro and Platform.1 route on Free, 5 on Basic, full routing from Foundation 25
Transactional and campaigns on one planYes 2A campaign travels the same send pipeline as a password reset, on the same plan and the same key.No — campaigns are a separate purchase 13The page says Marketing Campaigns and the Email API have to be bought separately.Yes, on a separate Broadcast stream 18Their pricing FAQ says transactional and marketing mail are kept on parallel, separate sending infrastructure.Not published 25
Idempotent sendsYes 4An Idempotency-Key is remembered for 24 hours.Not published 15Not published 20Not published 28
Versioned templatesYes 5Published versions with typed variables; every send records the version it used.Not published 15Not published 21Templates are created and edited through the API; the page does not describe versions.Not published 28
AutomationsYes 6In Marketing Campaigns, bought separately 13Not published 20Not published 25
SMTP relayYes 11smtp.rasket.com on 465 or 587, with an API key as the password. Each message is an ordinary API send.Yes 13Yes 23Yes 25
DKIM key size2048-bit, one key per domain 12Not published 15Not published 24Not published 28
Webhooks and developer tools
Signed webhooksYes 3Yes 14Their Signed Event Webhook.No 19Their webhook guide says Postmark does not sign webhooks with HMAC, and recommends HTTP basic authentication and an IP allowlist instead.Yes 26A token, a timestamp and an HMAC-SHA256 signature posted with the event.
Replay a webhook eventYes 3Send the event again from the dashboard or the API; a replay carries the identical payload under the same event id.Not published 14Not published 19Not published 27
MCP serverYes 7An HTTP MCP server with seven toolsets, plus a setup skill.Yes 16Twilio's MCP server, over the Twilio documentation and API.Not published 20Yes 29
Markdown docs and llms.txtYes 8Markdown at every docs URL, with llms.txt and llms-full.txt.Yes 15A .md suffix on a docs URL returns Markdown, and llms.txt indexes the set.An llms.txt index 20The index is published; a .md suffix on a documentation URL answered 404 on the day.Yes 28A .md suffix on a documentation URL returns Markdown, and llms.txt maps the set.
Official SDKsComing soon 9Node.js and Python clients are on the way. Today, every language sends over the REST API.C#, Go, Java, Node.js, PHP, Python and Ruby 17Node.js and TypeScript, Python, Ruby, PHP, Java and .NET 22Ruby, PHP, Python, Java, Go and Node.js 30
Plans and pricing
Free plan3,000 emails a month, 100 a day, 3 domains 10No free plan — a 60-day trial of 100 emails a day 13100 emails a month, and it does not expire 18No overage is allowed on it.100 emails a day 25
Entry paid plan$20 a month for 50,000 emails 10$19.95 a month for 50,000 emails 13The Essentials 50K plan.$15 a month for 10,000 emails 18The Basic plan. Fifty thousand emails is $55.$15 a month for 10,000 emails 25The Basic plan.
Extra emails, per 1,000$0.60 10The rate steps down to $0.25 as the Scale ladder climbs.$1.30 13The page prices extra emails at $0.0013 each on Essentials 50K, which is $1.30 per thousand.$1.80 18Basic, between 10,000 and 125,000 emails a month.From $1.80 on Basic 25From $1.30 on Foundation and from $1.10 on Scale.
Data retention30 days on the self-serve plans 10Custom retention on a Custom plan.3 days of searchable activity, 7 on Pro and Premier 1345 days, up to 365 with an add-on 18The retention add-on starts at $5 a month and needs a Pro plan.1 day of logs on Free and Basic, 5 on Foundation, 30 on Scale 25
Dedicated IP$30 a month per address on Scale 10Recommended above 5,000 emails a day; the choice is the customer's.One included on Pro and Premier 13The page says more can be added on; it does not state their price.$50 a month per IP, on Pro and above 18For senders above 300,000 emails a month.One included on Scale, extra IPs $59 a month each 25
Best forDevelopers who want sending, receiving and campaigns behind one API keyTeams already inside Twilio who want email on the same accountTeams who want transactional and bulk mail kept on separate streamsTeams who route inbound mail with rules and want a relay in front of it

Moving your domain off Resend

Verify your domain in Rasket and publish the DKIM, SPF and DMARC records we generate, then point your code at POST /emails and swap the key. An app that sends over SMTP changes only the host, to smtp.rasket.com, and the password, to a Rasket key: the username resend and the Resend-Idempotency-Key header are both accepted as they are. Templates are rewritten once and published as a version; contacts import from a CSV; each webhook endpoint is recreated with a new signing secret and can be replayed from the dashboard while you get the handler right. You can run both providers at once during the switch, because nothing about a verified domain is exclusive.

Nothing about a verified sending domain is exclusive, so both providers can hold it while you move. Send a small share of your mail through the new one first, watch the delivery and bounce events, and cut the rest over once the numbers look like the old ones.

Frequently asked questions

What is the best Resend alternative for developers?

We build Rasket, so read this as a disclosed preference and not a verdict. Yes, on the rows the table covers. Both send over a REST API and an SMTP relay, sign their webhooks, receive inbound mail and document themselves for agents. Rasket charges $0.60 per thousand extra emails against $0.90, and keeps campaigns on the same plan as transactional mail rather than pricing them separately. Resend has more SDK languages, so check that row before you move.

Is there a free Resend alternative?

Rasket: 3,000 emails a month, 100 a day, 3 domains. SendGrid: No free plan — a 60-day trial of 100 emails a day. Postmark: 100 emails a month, and it does not expire. Mailgun: 100 emails a day. Each figure is from that vendor's own pricing page on 2026-09-29.

Which Resend alternative includes inbound email?

Rasket: Yes. SendGrid: On the Pro and Premier plans. Postmark: On the Pro and Platform plans. Mailgun: 1 route on Free, 5 on Basic, full routing from Foundation. Inbound means receiving mail at your own domain, not just sending from it.

Which Resend alternative works with AI agents?

Rasket: Yes. SendGrid: Yes. Postmark: Not published. Mailgun: Yes. An MCP server is what lets an assistant call the API directly; Markdown docs and llms.txt is the other half, and it reads: Rasket: Yes. SendGrid: Yes. Postmark: An llms.txt index. Mailgun: Yes.

How do I move my domain off Resend?

Verify your domain in Rasket and publish the DKIM, SPF and DMARC records we generate, then point your code at POST /emails and swap the key. An app that sends over SMTP changes only the host, to smtp.rasket.com, and the password, to a Rasket key: the username resend and the Resend-Idempotency-Key header are both accepted as they are. Templates are rewritten once and published as a version; contacts import from a CSV; each webhook endpoint is recreated with a new signing secret and can be replayed from the dashboard while you get the handler right. You can run both providers at once during the switch, because nothing about a verified domain is exclusive.

Sources

  1. 1Rasket — https://www.rasket.com/features/receiving. Read 2026-09-16.
  2. 2Rasket — https://www.rasket.com/features/broadcasts. Read 2026-09-16.
  3. 3Rasket — https://www.rasket.com/features/webhooks. Read 2026-09-16.
  4. 4Rasket — https://www.rasket.com/docs/idempotency. Read 2026-09-16.
  5. 5Rasket — https://www.rasket.com/features/templates. Read 2026-09-16.
  6. 6Rasket — https://www.rasket.com/features/automations. Read 2026-09-16.
  7. 7Rasket — https://www.rasket.com/features/agents. Read 2026-09-16.
  8. 8Rasket — https://www.rasket.com/llms.txt. Read 2026-09-16.
  9. 9Rasket — https://www.rasket.com/docs/sdk/node. Read 2026-09-16.
  10. 10Rasket — https://www.rasket.com/pricing. Read 2026-09-16.
  11. 11Rasket — https://www.rasket.com/docs/smtp. Read 2026-09-29.
  12. 12Rasket — https://www.rasket.com/features/domains. Read 2026-09-16.
  13. 13SendGrid — https://www.twilio.com/en-us/products/email-api/pricing. Read 2026-09-16.
  14. 14SendGrid — https://www.twilio.com/docs/sendgrid/for-developers/tracking-events/event. Read 2026-09-16.
  15. 15SendGrid — https://www.twilio.com/docs/llms.txt. Read 2026-09-16.
  16. 16SendGrid — https://www.twilio.com/docs/ai/mcp. Read 2026-09-16.
  17. 17SendGrid — https://www.twilio.com/docs/sendgrid/for-developers/sending-email/libraries. Read 2026-09-16.
  18. 18Postmark — https://postmarkapp.com/pricing. Read 2026-09-16.
  19. 19Postmark — https://postmarkapp.com/developer/webhooks/webhooks-overview. Read 2026-09-16.
  20. 20Postmark — https://postmarkapp.com/llms.txt. Read 2026-09-16.
  21. 21Postmark — https://postmarkapp.com/developer/api/templates-api. Read 2026-09-16.
  22. 22Postmark — https://postmarkapp.com/developer/integration/official-libraries. Read 2026-09-16.
  23. 23Postmark — https://postmarkapp.com/developer/user-guide/send-email-with-smtp. Read 2026-09-16.
  24. 24Postmark — https://postmarkapp.com/developer/api/domains-api. Read 2026-09-16.
  25. 25Mailgun — https://www.mailgun.com/pricing/. Read 2026-09-16.
  26. 26Mailgun — https://documentation.mailgun.com/docs/mailgun/user-manual/webhooks/securing-webhooks. Read 2026-09-16.
  27. 27Mailgun — https://documentation.mailgun.com/docs/mailgun/user-manual/webhooks/webhooks. Read 2026-09-16.
  28. 28Mailgun — https://documentation.mailgun.com/llms.txt. Read 2026-09-16.
  29. 29Mailgun — https://documentation.mailgun.com/docs/mailgun/mcp. Read 2026-09-16.
  30. 30Mailgun — https://documentation.mailgun.com/docs/mailgun/sdk/introduction. Read 2026-09-16.

Last checked 2026-09-29. Prices and plan contents change. Every figure above was read from the linked page on the date beside it; if one has moved since, the page it came from is the one to trust.

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