chylex/SMTP-Relay
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Simple multi-account SMTP relay.
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Jonathon Reinhart 0e8986ca79
Expand allowedUsers email field to support comma-separated and domains () 
* Expand allowedUsers email field to support comma-separated and domains

Closes 

* Refactor AuthFetch() to return AuthUser struct

Also, this breaks out a parseLine() function which can be easily tested.

* Ignore empty addrs after splitting commas

This ignores a trailing comma

* Add tests for auth parseLine()

* Update documentation in smtprelay.ini

* Fix bug where addrAllowed() was incorrectly case-sensitive

* Update allowedUsers allowed domain format to require leading @

This disambiguates a local user ('john.smith') from a domain ('example.com')
2021-02-14 22:16:18 +01:00
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scripts Add release script as requested in 2020-05-20 18:33:40 +00:00
auth_test.go Expand allowedUsers email field to support comma-separated and domains () 2021-02-14 22:16:18 +01:00
auth.go Expand allowedUsers email field to support comma-separated and domains () 2021-02-14 22:16:18 +01:00
config.go Fix typo "addresses" 2020-09-03 14:06:20 +02:00
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LICENSE Update MIT license template 2018-12-08 21:16:10 +00:00
main_test.go Expand allowedUsers email field to support comma-separated and domains () 2021-02-14 22:16:18 +01:00
main.go Expand allowedUsers email field to support comma-separated and domains () 2021-02-14 22:16:18 +01:00
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smtp.go Fix spelling 2020-05-16 10:44:04 +00:00
smtprelay.ini Expand allowedUsers email field to support comma-separated and domains () 2021-02-14 22:16:18 +01:00

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