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Simple Golang SMTP relay/proxy server

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

Puu: v1.7.0
Haarat Tagit
ref-go-smtprela...
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Bernhard Froehlich fd1214442c Bump used Go versions to 1.17 3 vuotta sitten
.github 0ee982ea31 Bump used Go versions to 1.17 3 vuotta sitten
cmd 009ae8f73a hasher: Check number of arguments 4 vuotta sitten
LICENSE c707438ae8 Update MIT license template 6 vuotta sitten
README.md 2afbe67407 Add Go Report Card badge 5 vuotta sitten
auth.go 7f34fcbc99 gofmt: Fix formatting 4 vuotta sitten
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 vuotta sitten
config.go d8860fc917 Added external command support. 4 vuotta sitten
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 vuotta sitten
go.mod 3aecd3c6d6 Bump chrj/smtpd from 0.3.0 to 0.3.1 3 vuotta sitten
go.sum 3aecd3c6d6 Bump chrj/smtpd from 0.3.0 to 0.3.1 3 vuotta sitten
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 vuotta sitten
main.go 3f627d3281 Move AddReceivedLine before further processing. 4 vuotta sitten
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 vuotta sitten
smtp.go b36ed8eddb net/smtp: adds support for the SMTPUTF8 extension 4 vuotta sitten
smtprelay.ini d8860fc917 Added external command support. 4 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 to GMail without giving away my GMail 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 (GMail, MailGun or any other SMTP server)
  • Small codebase
  • IPv6 support