📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail
Sends and receives mail over SMTP and an HTTP API, with delivery tracking and webhooks.
alternatives to
SendGrid
Hosted email delivery service for transactional and marketing mail, over SMTP and an HTTP API. A closed product from Twilio.
Side by side
| Tool | Fit | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|---|
| Postal | Full replacement | 17k | MIT | Open source | Yes | Ruby | 3.3.7 | 2026-10-06 |
| useSend | Full replacement | 4.7k | AGPL-3.0 | Open source | Yes | TypeScript | v1.9.8 | 2026-09-08 |
| Haraka | Partial | 5.6k | MIT | Open source | Yes | JavaScript | v3.3.4 | 2026-10-03 |
| Plunk | Partial | 5.5k | AGPL-3.0 | Open source | Yes | TypeScript | v0.15.0 | 2026-10-06 |
| Hyvor Relay | Partial | 911 | AGPL-3.0 | Open source | Yes | PHP | 0.0.46 | 2026-09-30 |
Every alternative
5 alternatives
Open source alternative to Resend, Sendgrid, Postmark etc.
Transactional and marketing email over a REST API and SMTP, with webhooks and delivery stats, sent through Amazon SES.
- Language
- TypeScript
- Licence
- AGPL-3.0
- Stars
- 4.7k
- Latest
- v1.9.8
- Last push
- 2026-09-08
A fast, highly extensible, and event driven SMTP server
A plugin-based SMTP server in Node.js for high-volume inbound and outbound mail, without an HTTP API or tracking dashboard.
- Language
- JavaScript
- Licence
- MIT
- Stars
- 5.6k
- Latest
- v3.3.4
- Last push
- 2026-10-03
The Open-Source Email Platform
Transactional email over an HTTP API next to campaigns and automations, sent through Amazon SES.
- Language
- TypeScript
- Licence
- AGPL-3.0
- Stars
- 5.5k
- Latest
- v0.15.0
- Last push
- 2026-10-06
📨 Open-Source Email API for Developers. Cloud & Self-hosted Alternative to SES, Mailgun, SendGrid.
Transactional sending over an HTTP API and SMTP with bounce handling and webhooks; no marketing campaigns.
Head to head
About SendGrid
- Vendor
- Twilio