Self-hosted Transactional
Postal
Open-source mail delivery platform.
overview
Postal is a self-hosted mail server designed as an open-source alternative to SendGrid or Mailgun. Handles outbound and inbound, RESTful API, multi-domain. Operationally heavier than just running Postfix.
deliverability
You own it. Reputation depends on your IP, warmup discipline, and authentication.
best for
Teams with infra ops capacity that want full control of their mail delivery.
pros
- › Full control
- › Multi-domain, multi-tenant
- › Webhooks built in
cons
- › IP warming and reputation are on you
- › Operational overhead is real
Features at a glance
| API | Yes |
| SMTP | Yes |
| SDKs | node, ruby, php |
| Webhooks | Yes |
| Templates | basic |
| React Email | No |
| Batch send | Yes |
| Scheduled send | No |
| Suppressions | Yes |
| Multi-tenant | Yes |
| Inbound parsing | Yes |
| Event stream | Yes |
| Idempotency keys | No |
| Dedicated IP | Yes |
Appears in rankings
#01 →
Best self-hosted email
Most mature open-source SMTP-server replacement.
#01 →
Best open-source email stack
Outbound and inbound delivery server.
#06 →
Best for high-volume senders
Self-hosted option when unit cost matters and you have ops capacity.
#04 →
Best AWS SES alternatives
Self-host on your own infra if owning every layer is the goal.