Simple Golang SMTP relay/proxy server
go
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Bernhard Fröhlich 6270d75571
Improve TLS Config to prefer server ciphers, remove 3DES ciphers and require TLS 1.1 or higher
2 weeks ago
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README.md Rename to smtprelay 3 weeks ago
auth.go Fixes for new authentication code 2 weeks ago
config.go Bump version to 1.2.0 2 weeks ago
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go.sum Authentication checker converted to store passwords as bcrypt hashes 3 weeks ago
main.go Improve TLS Config to prefer server ciphers, remove 3DES ciphers and require TLS 1.1 or higher 2 weeks ago
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smtprelay.ini Rename to smtprelay 3 weeks ago

README.md

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 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
  • IPv6 support