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Simple Golang SMTP relay/proxy server

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

Дрво: 2a6a0ef76d
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ref-go-smtprela...
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dependabot[bot] 2a6a0ef76d build(deps): Bump github/codeql-action from 3.28.16 to 3.28.17 пре 3 месеци
.github 2a6a0ef76d build(deps): Bump github/codeql-action from 3.28.16 to 3.28.17 пре 2 месеци
cmd 009ae8f73a hasher: Check number of arguments пре 4 година
LICENSE c707438ae8 Update MIT license template пре 6 година
README.md 2358b735b1 Add badge for OpenSSF scorecard (#181) пре 6 месеци
SECURITY.md 687c793203 Create SECURITY.md (#175) пре 6 месеци
auth.go 7f34fcbc99 gofmt: Fix formatting пре 4 година
auth_test.go 7f34fcbc99 gofmt: Fix formatting пре 4 година
config.go 5b5f738410 make possible #91. пре 2 година
config_test.go 441a53cfd9 Fix code formatting with gofmt -s пре 4 година
go.mod a06d7a6296 build(deps): Bump golang.org/x/crypto from 0.36.0 to 0.37.0 пре 3 месеци
go.sum a06d7a6296 build(deps): Bump golang.org/x/crypto from 0.36.0 to 0.37.0 пре 3 месеци
logger.go 441a53cfd9 Fix code formatting with gofmt -s пре 4 година
main.go 0d4e43e723 Fix formatting with gofmt пре 6 месеци
main_test.go 7f34fcbc99 gofmt: Fix formatting пре 4 година
remotes.go ee8a5dd989 Fix code formatting пре 3 година
remotes_test.go 875264837e add test coverage for scheme validation пре 3 година
smtp.go 5cd81cd7e4 smtp: gofmt main repo пре 3 година
smtprelay.ini 2590282fa4 Add strict_sender to smtprelay.ini пре 2 година

README.md

smtprelay

Go Report Card OpenSSF Scorecard

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