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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

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

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