WTF is an SMTP relay and why is it called relay? | by Imran Shaikh | Medium
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Self-Hosted Email Server · GitHub
Bizagi Studio > Process wizard > Business Rules > Defining notifications > Email server configuration > Using an SMTP server > Using hMailServer as an SMTP server
GitHub - riegel/node.js-SMTP-server: SMTP server for sending attached images to a web server
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GitHub - r0stig/basic-smtpserver: A basic SMTP server powered by Node.js, could be used as a local mail server for development or a skeleton for a more advanced mail server.