What are proper header identification practices?
Proper header identification practices include using accurate, consistent From addresses, valid Reply-To addresses if different from From, and correct organizational headers. Headers should honestly represent who sent the message and how to respond.
Date headers should reflect actual sending time. Message-ID headers should be unique and properly formatted. List headers (List-Unsubscribe, List-Id) should accurately identify mailing list characteristics when applicable.
Avoid misleading headers like fake Re: or Fwd: prefixes, deceptive sender names, or headers implying personal relationship when sending bulk mail. Such manipulation violates best practices and may violate regulations like CAN-SPAM.
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