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An in-depth look at forwarding and monitoring e-mails using the Postfix mail server

One of the original Internet services was SMTP (the Simple Mail Transfer Protocol). Within its original RFC (Request For Comments 821: https://www.ietf.org/rfc/rfc821.txt) which was published in August 1982 there was lots of forward planning and most likely as a result it remains one of the fundamental cornerstones of the Internet that we know and love today.