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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 fe32180fbc Remove i386 from release builds 3 anos atrás
.github c21c13cc7a Remove i386 from release builds 3 anos atrás
cmd 009ae8f73a hasher: Check number of arguments 4 anos atrás
LICENSE c707438ae8 Update MIT license template 6 anos atrás
README.md 1617155f1e Remove service names from readme 3 anos atrás
auth.go 7f34fcbc99 gofmt: Fix formatting 4 anos atrás
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 anos atrás
config.go 4221919689 Allow config to have multiple remotes. 3 anos atrás
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 anos atrás
go.mod ce97293e33 Update Go crypto and sys dependencies 3 anos atrás
go.sum ce97293e33 Update Go crypto and sys dependencies 3 anos atrás
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 anos atrás
main.go b134e426d7 Propagate the error to the client if the external command fails (#40) 3 anos atrás
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 anos atrás
remotes.go b7f3701502 Add missing default port for starttls and validate scheme to ensure support 3 anos atrás
remotes_test.go 875264837e add test coverage for scheme validation 3 anos atrás
smtp.go 5cd81cd7e4 smtp: gofmt main repo 3 anos atrás
smtprelay.ini 5e78bbe643 Improve remotes documentation in config 3 anos atrás

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

  • 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