Don’t spoof sender email addresses
Don’t spoof sender email addresses

Neither sendmail nor smtp should allow sending from arbitrary email
domains. Receiving servers are highly likely to reject or junk spoofed
messages from senders with SPF and DKIM protection. It violates the
CAN-SPAM Act too.

Use the noreply email address instead. The sending server is
expected to be configured to handle email on behalf off this
email address.

Include the the posting user in the reply-to header instead.

Dropped the SpamAssassin score in test mailings from +3.6 to -2.1.
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