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ref-go-smtprelay
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Simple Golang SMTP relay/proxy server

Topics
#golang #proxy-server #smtp-server #smtp-relay #ssl #load-balancer

Tree: v1.1.0
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ref-go-smtprela...
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Bernhard Froehlich 0d6183041f Bump version to 1.1.0 6 years ago
LICENSE c707438ae8 Update MIT license template 6 years ago
README.md 3c1d683edc Update documentation for SMTPS support (outgoing) 6 years ago
go.mod 58d124b20d Switch dependency back to chrj/smtpd since my fixes were merged 6 years ago
go.sum 58d124b20d Switch dependency back to chrj/smtpd since my fixes were merged 6 years ago
main.go c05e5779a8 Bump version to 1.1.0 6 years ago
smtp-proxy.ini e87b1e7168 Implement authentication checker against a plaintext file 6 years ago
smtp.go 3c1d683edc Update documentation for SMTPS support (outgoing) 6 years ago

README.md

smtp-proxy

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 to GMail without giving away my GMail credentials to each device which produces mail.

Main features

  • 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 (GMail, MailGun or any other SMTP server)
  • Small codebase (smtp-proxy ~250 LoC, chrj/smtpd ~1200 LoC)
  • IPv6 support