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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

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Jonathon Reinhart 7fa0eebf95 Simplify range code for setting up listeners 4 years ago
.github 9040a456cf Create codeql-analysis.yml 5 years ago
cmd 076fd65dea Use default cost for bcrypt 5 years ago
scripts b42ad6ddc9 Add release script as requested in #2 5 years ago
LICENSE c707438ae8 Update MIT license template 6 years ago
README.md 2afbe67407 Add Go Report Card badge 5 years ago
auth.go 0e8986ca79 Expand allowedUsers email field to support comma-separated and domains (#9) 4 years ago
auth_test.go 0e8986ca79 Expand allowedUsers email field to support comma-separated and domains (#9) 4 years ago
config.go 999cfea307 Fix typo "addresses" 5 years ago
go.mod 4e0bf0908d Update dependencies 5 years ago
go.sum 4e0bf0908d Update dependencies 5 years ago
main.go 7fa0eebf95 Simplify range code for setting up listeners 4 years ago
main_test.go 0e8986ca79 Expand allowedUsers email field to support comma-separated and domains (#9) 4 years ago
smtp.go 999ccab778 Fix spelling 5 years ago
smtprelay.ini 0e8986ca79 Expand allowedUsers email field to support comma-separated and domains (#9) 4 years ago

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