Mailgun alternatives
Providers that compete with Mailgun on at least one of: Transactional
Developer-leaning email infra, owned by Sinch.
Switching as teams building autonomous agents
An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.
Mailgun does not cover idempotency keys, operating track record, and best published rate per 1,000. Resend is the only option below that closes that gap. The order below weighs this audience's priorities first, so it differs from a general popularity ranking.
ranked for teams building autonomous agents
- 01
Resend
TransactionalEmail API tightly coupled to React Email.
Adds idempotency keys, gives up multi-tenant support.
3,000/mo permanent, capped at 100/day, one domain · $20/mo for 50,000 emails - 02
Postmark
TransactionalTransactional-only, fast and well-delivered.
Matches Mailgun on every priority weighed here, so the decision is price and preference.
100/mo developer plan · $15/mo for 10,000 emails - 03
MailerSend
TransactionalModern transactional API with a clean UI.
Matches Mailgun on every priority weighed here, so the decision is price and preference.
500/mo permanent · $7/mo for 5,000 emails - 04
SMTP2GO
TransactionalReliable SMTP relay with strong deliverability.
Matches Mailgun on every priority weighed here, so the decision is price and preference.
1,000/mo permanent · $10/mo for 10,000 emails - 05
Brevo
Transactional MarketingAll-in-one with a generous daily free tier.
Gives up multi-tenant support against Mailgun and adds nothing on these priorities.
300/day permanent · $9/mo for 5,000 emails - 06
Cloudflare Email Service
Inbound TransactionalFree routing, programmable inbound via Workers, sending in beta.
Gives up webhook coverage against Mailgun and adds nothing on these priorities.
Email Routing free; Email Workers on Workers Free plan · Sending: $0.35 per 1,000 messages (Workers Paid required, $5/mo) - 07
Mailtrap
Transactional TestingOriginally a staging inbox, now a sender too.
Gives up inbound parsing against Mailgun and adds nothing on these priorities.
4,000/mo (sending), free testing tier · $15/mo for 10,000 sending - 08
Loops
Marketing TransactionalModern lifecycle and broadcast email for SaaS.
Gives up inbound parsing and multi-tenant support against Mailgun and adds nothing on these priorities.
1,000 contacts and 4,000 sends/mo on the Free plan · $49/mo for 5,000 contacts
Mailgun and its alternatives, side by side
Columns are the priorities teams building autonomous agents weigh, in order. Mailgun is the first row so the trade in each direction is readable at a glance.
| Provider | Inbound parsing | Idempotency keys | Webhooks | Operating since | Event stream | Best published rate per 1,000 | Batch sending | SDKs | Multi-tenant |
|---|---|---|---|---|---|---|---|---|---|
| Mailgun | Yes | No | Yes | 2010 | Yes | $0.70 | Yes | node, python, go, ruby, php, java | Yes |
| Resend | Yes | Yes | Yes | 2023 | Yes | $0.35 | Yes | node, python, go, ruby, php, rust, java, elixir, cli | No |
| Postmark | Yes | No | Yes | 2010 | Yes | $1.50 | Yes | node, python, go, ruby, php, java, elixir, rust, dotnet | Yes |
| MailerSend | Yes | No | Yes | 2020 | Yes | Tiers not published in comparable form | Yes | node, python, go, ruby, php | Yes |
| SMTP2GO | Yes | No | Yes | 2006 | Yes | Tiers not published in comparable form | Yes | node, python, go, ruby, php | Yes |
| Brevo | Yes | No | Yes | 2012 | Yes | Tiers not published in comparable form | Yes | node, python, go, ruby, php, java, dotnet | No |
| Cloudflare Email Service | Yes | No | No | Not published | Yes | Tiers not published in comparable form | Yes | node | Yes |
| Mailtrap | No | No | Yes | 2014 | Yes | Tiers not published in comparable form | Yes | node, python, go, ruby, php, elixir | Yes |
| Loops | No | No | Yes | 2022 | Yes | Tiers not published in comparable form | Yes | node, python, go, ruby, php | No |
Nothing on this list is a clean upgrade: every alternative trades something away against Mailgun on these priorities, so the choice depends on which of them the build actually needs.
before you switch
Mailgun pricing, tier by tier
All 3 paid tiers with effective cost per 1,000 emails. Worth checking whether the cost curve, rather than the feature set, is what is prompting the switch.