Simple Golang SMTP relay/proxy server
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Bernhard Fröhlich 2c9645ac68
Add drone config
vor 2 Monaten
.drone.yml Add drone config vor 2 Monaten
LICENSE Update MIT license template vor 7 Monaten Rename to smtprelay vor 6 Monaten
auth.go Fix formatting vor 5 Monaten
config.go Fix formatting vor 5 Monaten
go.mod Rename to smtprelay vor 6 Monaten
go.sum Authentication checker converted to store passwords as bcrypt hashes vor 6 Monaten
main.go Improve error checking vor 5 Monaten
smtp.go Revert package renaming vor 6 Monaten
smtprelay.ini Rename to smtprelay vor 6 Monaten


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