https://github.com/decke/smtprelay

Simple Golang SMTP relay/proxy server
https://github.com/decke/smtprelay

golang proxy-server smtp-relay smtp-server

Last synced: 7 days ago
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Simple Golang SMTP relay/proxy server

• Host: GitHub
• URL: https://github.com/decke/smtprelay
• Owner: decke
• License: mit
• Created: 2019-10-13T12:59:23.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2024-09-06T18:40:25.000Z (2 months ago)
• Last Synced: 2024-09-06T22:04:27.229Z (2 months ago)
• Topics: golang, proxy-server, smtp-relay, smtp-server
• Language: Go
• Homepage:
• Size: 272 KB
• Stars: 442
• Watchers: 9
• Forks: 108
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-opensource-email - SMTPRelay - Simple Golang SMTP relay/proxy server - `MIT`, `Go` (Sending / SMTP Server)

README

        
# smtprelay

[![Go Report Card](https://goreportcard.com/badge/github.com/decke/smtprelay)](https://goreportcard.com/report/github.com/decke/smtprelay)

Simple Golang based SMTP relay/proxy server that accepts mail via SMTP

and forwards it directly to another SMTP server.

## Why another SMTP server?

Outgoing mails are usually send via SMTP to an MTA (Mail Transfer Agent)

which is one of Postfix, Exim, Sendmail or OpenSMTPD on UNIX/Linux in most

cases. You really don't want to setup and maintain any of those full blown

kitchensinks yourself because they are complex, fragile and hard to

configure.

My use case is simple. I need to send automatically generated mails from

cron via msmtp/sSMTP/dma, mails from various services and network printers

via a remote SMTP server without giving away my mail credentials to each

device which produces mail.

## Main features

* Simple configuration with ini file .env file or environment variables

* Supports SMTPS/TLS (465), STARTTLS (587) and unencrypted SMTP (25)

* Checks for sender, receiver, client IP

* Authentication support with file (LOGIN, PLAIN)

* Enforce encryption for authentication

* Forwards all mail to a smarthost (any SMTP server)

* Small codebase

* IPv6 support