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ref-go-smtprelay
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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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Bernhard Froehlich cff075dd8b Support .env files if it exists 3 years ago
.github e98a1c6f25 Bump wangyoucao577/go-release-action from 1.29 to 1.30 3 years ago
cmd 009ae8f73a hasher: Check number of arguments 4 years ago
LICENSE c707438ae8 Update MIT license template 6 years ago
README.md 813bd9ebe7 Support .env files if it exists 3 years ago
auth.go 7f34fcbc99 gofmt: Fix formatting 4 years ago
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 years ago
config.go 813bd9ebe7 Support .env files if it exists 3 years ago
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 years ago
go.mod cdc0fe931b Bump github.com/peterbourgon/ff/v3 from 3.1.2 to 3.3.0 3 years ago
go.sum cdc0fe931b Bump github.com/peterbourgon/ff/v3 from 3.1.2 to 3.3.0 3 years ago
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 years ago
main.go e3ba45ede2 Fix output for "-version" to not contain unneccessary noise 3 years ago
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 years ago
remotes.go ee8a5dd989 Fix code formatting 3 years ago
remotes_test.go 875264837e add test coverage for scheme validation 3 years ago
smtp.go 5cd81cd7e4 smtp: gofmt main repo 3 years ago
smtprelay.ini c83544bd90 Add note how to use environment variables for configuration 3 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 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