Initial commit

apps/smtprelay/.gitignore

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+smtprelay

apps/smtprelay/README.md

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+# smtprelay
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/decke/smtprelay)](https://goreportcard.com/report/github.com/decke/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

apps/smtprelay/smtp-relay.service

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+[Unit]
+Description=Smtp relay Service
+After=network.target
+
+[Service]
+ExecStart=/var/deploy/apps/smtprelay/smtprelay -config /var/deploy/apps/smtprelay/secrets/smtprelay.ini
+Restart=always
+User=root
+
+[Install]
+WantedBy=multi-user.target