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Simple Golang SMTP relay/proxy server

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

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

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