README
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smtprelay
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
Documentation
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Overview ¶
Package smtp implements the Simple Mail Transfer Protocol as defined in RFC 5321. It also implements the following extensions:
8BITMIME RFC 1652 AUTH RFC 2554 STARTTLS RFC 3207
Additional extensions may be handled by clients.
The smtp package is frozen and is not accepting new features. Some external packages provide more functionality. See:
https://godoc.org/?q=smtp
Source Files
Directories