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
1ヶ月前
LICENSE Update MIT license template 2ヶ月前
README.md Rename to smtprelay 1ヶ月前
auth.go Fixes for new authentication code 1ヶ月前
config.go Bump version to 1.2.0 1ヶ月前
go.mod Rename to smtprelay 1ヶ月前
go.sum Authentication checker converted to store passwords as bcrypt hashes 1ヶ月前
main.go Improve TLS Config to prefer server ciphers, remove 3DES ciphers and require TLS 1.1 or higher 1ヶ月前
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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