Postal vs SendGrid
Postal and SendGrid both handle transactional and marketing email, but from opposite infrastructure positions. Postal is MIT licensed and runs on your own servers; SendGrid is a proprietary cloud service.
| Feature | Postal | SendGrid |
|---|
| License | MIT | Proprietary |
| Self-hosting | Yes | No |
| Billing | Server cost | Per-email |
| Email types | Inbound and outbound | Outbound (inbound via webhook) |
Postal is the better choice when volume is high and per-email costs are a concern, or when data residency requirements prevent routing email through third-party APIs. SendGrid is worth using when enterprise deliverability guarantees and marketing campaign tooling matter more than infrastructure control.
Postal vs Postmark
Postmark focuses specifically on transactional deliverability, claiming 98%+ inbox placement rates with strict stream separation between transactional and bulk email. Postal handles both inbound and outbound email more broadly, giving you full control over the mail server.
| Feature | Postal | Postmark |
|---|
| License | MIT | Proprietary |
| Self-hosting | Yes | No |
| Billing | Server cost | Per-email |
| Inbound email | Yes | Yes |
| Deliverability | Depends on server reputation | 98%+ inbox placement stated |
Postmark is worth the per-email cost when reliable transactional delivery is critical and you want no infrastructure overhead. Postal is the right choice when cost at scale and data ownership outweigh managed deliverability convenience.
Postal vs Amazon SES
Amazon SES is pay-per-use email infrastructure on AWS. For teams already in the AWS ecosystem, it is a low-cost sending path; Postal offers more than sending alone, including inbound email routing, at the cost of server management.
Postal is the better fit for teams that want a mail server with inbound routing outside of AWS. Amazon SES is worth considering for AWS-native applications where pay-per-use pricing and tight AWS integration matter more than self-hosting.
