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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

Gren: master
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ref-go-smtprela...
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dependabot[bot] 843c02aa0e build(deps): Bump github/codeql-action from 3.29.3 to 3.29.4 2 dagar sedan
.github 843c02aa0e build(deps): Bump github/codeql-action from 3.29.3 to 3.29.4 2 dagar sedan
LICENSE c707438ae8 Update MIT license template 6 år sedan
README.md 2358b735b1 Add badge for OpenSSF scorecard (#181) 5 månader sedan
SECURITY.md 687c793203 Create SECURITY.md (#175) 5 månader sedan
auth.go 7f34fcbc99 gofmt: Fix formatting 4 år sedan
auth_test.go 7f34fcbc99 gofmt: Fix formatting 4 år sedan
config.go 5b5f738410 make possible #91. 2 år sedan
config_test.go 441a53cfd9 Fix code formatting with gofmt -s 4 år sedan
go.mod 8f12438b5a build(deps): Bump golang.org/x/crypto from 0.39.0 to 0.40.0 2 veckor sedan
go.sum 8f12438b5a build(deps): Bump golang.org/x/crypto from 0.39.0 to 0.40.0 2 veckor sedan
logger.go 441a53cfd9 Fix code formatting with gofmt -s 4 år sedan
main.go cafbc78e74 set transient response code on potential temporary error conditions 2 månader sedan
main_test.go 7f34fcbc99 gofmt: Fix formatting 4 år sedan
remotes.go ee8a5dd989 Fix code formatting 2 år sedan
remotes_test.go 875264837e add test coverage for scheme validation 3 år sedan
smtp.go 085052b96a smtp: ignore HELO error in QUIT 1 månad sedan
smtprelay.ini 51ed156dad Remove cmd/hasher for bcrypt. 1 månad sedan

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