Simple Golang SMTP relay/proxy server
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Bernhard Fröhlich 21b597f351
Bump version to 1.3.0
2 weeks ago
.drone.yml Add drone config 4 months ago
LICENSE Update MIT license template 9 months ago Rename to smtprelay 8 months ago
auth.go Fix formatting 7 months ago
config.go Bump version to 1.3.0 2 weeks ago
go.mod Update dependencies 2 weeks ago
go.sum Update dependencies 2 weeks ago
main.go Allows specify the sender used on SMTP conversation with outgoing server. 2 weeks ago
smtp.go Revert package renaming 8 months ago
smtprelay.ini Adjust the description of remote_sender parameter. 2 weeks ago


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