Simple Golang SMTP relay/proxy server
Вы не можете выбрать более 25 тем Темы должны начинаться с буквы или цифры, могут содержать дефисы(-) и должны содержать не более 35 символов.
Bernhard Fröhlich 770e819e2b
Improve error checking
1 месяц назад
LICENSE Update MIT license template 4 месяцев назад Rename to smtprelay 3 месяцев назад
auth.go Fix formatting 1 месяц назад
config.go Fix formatting 1 месяц назад
go.mod Rename to smtprelay 3 месяцев назад
go.sum Authentication checker converted to store passwords as bcrypt hashes 3 месяцев назад
main.go Improve error checking 1 месяц назад
smtp.go Revert package renaming 3 месяцев назад
smtprelay.ini Rename to smtprelay 3 месяцев назад


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