SMTP.com alternatives
Providers that compete with SMTP.com on at least one of: Transactional
Legacy SMTP relay and email delivery service.
Switching as developers picking email infrastructure
The question here is which one a backend engineer would rather operate. That means SDK depth in the language already in use, whether a retry can safely be replayed, how much the event log tells you when a customer says the email never arrived, and whether the pricing curve stays sane as volume grows.
SMTP.com does not cover SDK breadth and idempotency keys. Resend, Postmark, and Loops close that gap. The order below weighs this audience's priorities first, so it differs from a general popularity ranking.
ranked for developers picking email infrastructure
- 01
Resend
TransactionalEmail API tightly coupled to React Email.
Adds SDK breadth and idempotency keys over SMTP.com, with nothing given up on these priorities.
3,000/mo permanent, capped at 100/day, one domain · $20/mo for 50,000 emails - 02
Postmark
TransactionalTransactional-only, fast and well-delivered.
Adds SDK breadth over SMTP.com, with nothing given up on these priorities.
100/mo developer plan · $15/mo for 10,000 emails - 03
Loops
Marketing TransactionalModern lifecycle and broadcast email for SaaS.
Adds SDK breadth over SMTP.com, with nothing given up on these priorities.
1,000 contacts and 4,000 sends/mo on the Free plan · $49/mo for 5,000 contacts - 04
Mailtrap
Transactional TestingOriginally a staging inbox, now a sender too.
Adds SDK breadth over SMTP.com, with nothing given up on these priorities.
4,000/mo (sending), free testing tier · $15/mo for 10,000 sending - 05
MailerSend
TransactionalModern transactional API with a clean UI.
Adds SDK breadth over SMTP.com, with nothing given up on these priorities.
500/mo permanent · $7/mo for 5,000 emails - 06
Mailgun
TransactionalDeveloper-leaning email infra, owned by Sinch.
Adds SDK breadth over SMTP.com, with nothing given up on these priorities.
100/day permanent free plan · $15/mo for 10,000 emails (Basic) - 07
Brevo
Transactional MarketingAll-in-one with a generous daily free tier.
Adds SDK breadth over SMTP.com, with nothing given up on these priorities.
300/day permanent · $9/mo for 5,000 emails - 08
Cloudflare Email Service
Inbound TransactionalFree routing, programmable inbound via Workers, sending in beta.
Adds SDK breadth, gives up webhook coverage.
Email Routing free; Email Workers on Workers Free plan · Sending: $0.35 per 1,000 messages (Workers Paid required, $5/mo)
SMTP.com and its alternatives, side by side
Columns are the priorities developers picking email infrastructure weigh, in order. SMTP.com is the first row so the trade in each direction is readable at a glance.
| Provider | DX score | SDKs | Idempotency keys | Operating since | Event stream | Best published rate per 1,000 | Webhooks |
|---|---|---|---|---|---|---|---|
| SMTP.com | 4/10 | None | No | Not published | Yes | Tiers not published in comparable form | Yes |
| Resend | 8/10 | node, python, go, ruby, php, rust, java, elixir, cli | Yes | 2023 | Yes | $0.35 | Yes |
| Postmark | 9/10 | node, python, go, ruby, php, java, elixir, rust, dotnet | No | 2010 | Yes | $1.50 | Yes |
| Loops | 9/10 | node, python, go, ruby, php | No | 2022 | Yes | Tiers not published in comparable form | Yes |
| Mailtrap | 8/10 | node, python, go, ruby, php, elixir | No | 2014 | Yes | Tiers not published in comparable form | Yes |
| MailerSend | 8/10 | node, python, go, ruby, php | No | 2020 | Yes | Tiers not published in comparable form | Yes |
| Mailgun | 7/10 | node, python, go, ruby, php, java | No | 2010 | Yes | $0.70 | Yes |
| Brevo | 7/10 | node, python, go, ruby, php, java, dotnet | No | 2012 | Yes | Tiers not published in comparable form | Yes |
| Cloudflare Email Service | 8/10 | node | No | Not published | Yes | Tiers not published in comparable form | No |
Resend, Postmark, and Loops add capability without giving anything up on these priorities. The rest trade one thing for another.