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Simple Golang SMTP relay/proxy server

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

Boom: 73ebc6c35c
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ref-go-smtprela...
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Bernhard Froehlich 73ebc6c35c Fix Release workflow 2 jaren geleden
.github 6857874c88 Fix Release workflow 2 jaren geleden
cmd 009ae8f73a hasher: Check number of arguments 4 jaren geleden
LICENSE c707438ae8 Update MIT license template 6 jaren geleden
README.md 813bd9ebe7 Support .env files if it exists 3 jaren geleden
auth.go 7f34fcbc99 gofmt: Fix formatting 4 jaren geleden
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 jaren geleden
config.go 813bd9ebe7 Support .env files if it exists 3 jaren geleden
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 jaren geleden
go.mod 7e318cbcbc Bump minimum Go version to 1.20 2 jaren geleden
go.sum 3697382181 Bump golang.org/x/crypto from 0.9.0 to 0.10.0 2 jaren geleden
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 jaren geleden
main.go cc064e497e command: Add some environment variables when calling external cmd 2 jaren geleden
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 jaren geleden
remotes.go ee8a5dd989 Fix code formatting 3 jaren geleden
remotes_test.go 875264837e add test coverage for scheme validation 3 jaren geleden
smtp.go 5cd81cd7e4 smtp: gofmt main repo 3 jaren geleden
smtprelay.ini c83544bd90 Add note how to use environment variables for configuration 3 jaren geleden

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 via a remote SMTP server without giving away my mail credentials to each device which produces mail.

Main features

  • Simple configuration with ini file .env file or environment variables
  • 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 (any SMTP server)
  • Small codebase
  • IPv6 support