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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

Koks: cc8d678e18
Atzari Tagi
ref-go-smtprela...
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dependabot[bot] cc8d678e18 build(deps): Bump golang.org/x/crypto from 0.37.0 to 0.38.0 3 mēneši atpakaļ
.github 2a6a0ef76d build(deps): Bump github/codeql-action from 3.28.16 to 3.28.17 2 mēneši atpakaļ
cmd 009ae8f73a hasher: Check number of arguments 4 gadi atpakaļ
LICENSE c707438ae8 Update MIT license template 6 gadi atpakaļ
README.md 2358b735b1 Add badge for OpenSSF scorecard (#181) 6 mēneši atpakaļ
SECURITY.md 687c793203 Create SECURITY.md (#175) 6 mēneši atpakaļ
auth.go 7f34fcbc99 gofmt: Fix formatting 4 gadi atpakaļ
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 gadi atpakaļ
config.go 5b5f738410 make possible #91. 2 gadi atpakaļ
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 gadi atpakaļ
go.mod cc8d678e18 build(deps): Bump golang.org/x/crypto from 0.37.0 to 0.38.0 2 mēneši atpakaļ
go.sum cc8d678e18 build(deps): Bump golang.org/x/crypto from 0.37.0 to 0.38.0 2 mēneši atpakaļ
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 gadi atpakaļ
main.go 0d4e43e723 Fix formatting with gofmt 6 mēneši atpakaļ
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 gadi atpakaļ
remotes.go ee8a5dd989 Fix code formatting 3 gadi atpakaļ
remotes_test.go 875264837e add test coverage for scheme validation 3 gadi atpakaļ
smtp.go 5cd81cd7e4 smtp: gofmt main repo 3 gadi atpakaļ
smtprelay.ini 2590282fa4 Add strict_sender to smtprelay.ini 2 gadi atpakaļ

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