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Simple Golang SMTP relay/proxy server

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

Drzewo: v1.11.2
Gałęzie Tagi
ref-go-smtprela...
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Bernhard Froehlich 3bff3e0069 Fix formatting with gofmt 7 miesięcy temu
.github 27d21b2a5b CI: Bump release to Go 1.23 7 miesięcy temu
cmd 009ae8f73a hasher: Check number of arguments 4 lat temu
LICENSE c707438ae8 Update MIT license template 6 lat temu
README.md 813bd9ebe7 Support .env files if it exists 3 lat temu
auth.go 7f34fcbc99 gofmt: Fix formatting 4 lat temu
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 lat temu
config.go 5b5f738410 make possible #91. 2 lat temu
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 lat temu
go.mod f6a325289d Bump golang.org/x/crypto from 0.31.0 to 0.32.0 (#171) 8 miesięcy temu
go.sum f6a325289d Bump golang.org/x/crypto from 0.31.0 to 0.32.0 (#171) 8 miesięcy temu
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 lat temu
main.go 0d4e43e723 Fix formatting with gofmt 7 miesięcy temu
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 lat temu
remotes.go ee8a5dd989 Fix code formatting 3 lat temu
remotes_test.go 875264837e add test coverage for scheme validation 3 lat temu
smtp.go 5cd81cd7e4 smtp: gofmt main repo 3 lat temu
smtprelay.ini 2590282fa4 Add strict_sender to smtprelay.ini 2 lat temu

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