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Simple Golang SMTP relay/proxy server

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

Puu: v1.11.1
Haarat Tagit
ref-go-smtprela...
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Bernhard Froehlich ab9334249f ci: Add missing permissions for release workflow 1 vuosi sitten
.github 6919131eec ci: Add missing permissions for release workflow 1 vuosi sitten
cmd 009ae8f73a hasher: Check number of arguments 4 vuotta sitten
LICENSE c707438ae8 Update MIT license template 6 vuotta sitten
README.md 813bd9ebe7 Support .env files if it exists 3 vuotta sitten
auth.go 7f34fcbc99 gofmt: Fix formatting 4 vuotta sitten
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 vuotta sitten
config.go 5b5f738410 make possible #91. 2 vuotta sitten
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 vuotta sitten
go.mod ae0f9ba0b6 Update go dependencies 1 vuosi sitten
go.sum ae0f9ba0b6 Update go dependencies 1 vuosi sitten
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 vuotta sitten
main.go 6c1bffcff0 Merge branch 'decke:master' into master 2 vuotta sitten
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 vuotta sitten
remotes.go ee8a5dd989 Fix code formatting 3 vuotta sitten
remotes_test.go 875264837e add test coverage for scheme validation 3 vuotta sitten
smtp.go 5cd81cd7e4 smtp: gofmt main repo 3 vuotta sitten
smtprelay.ini 2590282fa4 Add strict_sender to smtprelay.ini 2 vuotta sitten

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