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32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
# smtprelay
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[](https://goreportcard.com/report/github.com/decke/smtprelay)
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Simple Golang based SMTP relay/proxy server that accepts mail via SMTP
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and forwards it directly to another SMTP server.
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## Why another SMTP server?
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Outgoing mails are usually send via SMTP to an MTA (Mail Transfer Agent)
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which is one of Postfix, Exim, Sendmail or OpenSMTPD on UNIX/Linux in most
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cases. You really don't want to setup and maintain any of those full blown
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kitchensinks yourself because they are complex, fragile and hard to
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configure.
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My use case is simple. I need to send automatically generated mails from
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cron via msmtp/sSMTP/dma, mails from various services and network printers
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to GMail without giving away my GMail credentials to each device which
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produces mail.
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## Main features
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* Supports SMTPS/TLS (465), STARTTLS (587) and unencrypted SMTP (25)
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* Checks for sender, receiver, client IP
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* Authentication support with file (LOGIN, PLAIN)
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* Enforce encryption for authentication
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* Forwards all mail to a smarthost (GMail, MailGun or any other SMTP server)
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* Small codebase
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* IPv6 support
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