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Simple Golang SMTP relay/proxy server

Topics
#golang #proxy-server #smtp-server #smtp-relay #ssl #load-balancer

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Jonathon Reinhart 918df65a3a Require that networks in allowed_nets are networks and not hosts 4 years ago
.github 822dbbce7d Bump Go to 1.15 for CI builds 4 years ago
cmd 009ae8f73a hasher: Check number of arguments 4 years ago
LICENSE c707438ae8 Update MIT license template 6 years ago
README.md 2afbe67407 Add Go Report Card badge 5 years ago
auth.go 7f34fcbc99 gofmt: Fix formatting 4 years ago
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 years ago
config.go 918df65a3a Require that networks in allowed_nets are networks and not hosts 4 years ago
go.mod 34cb47c364 Implement structured logs using logrus 4 years ago
go.sum 34cb47c364 Implement structured logs using logrus 4 years ago
logger.go 9921b38046 Explicitly configure default logfile for stderr 4 years ago
main.go 0503c12ccd Allow "allowed_nets" to be empty, meaning any network is allowed 4 years ago
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 years ago
smtp.go b36ed8eddb net/smtp: adds support for the SMTPUTF8 extension 4 years ago
smtprelay.ini 918df65a3a Require that networks in allowed_nets are networks and not hosts 4 years ago

README.md

smtprelay

Go Report Card

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