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Is there a guide/cheat sheet that explains Email/SMTP headers in detail? I could not find any useful resources after plenty of Googling.

The purpose is to understand the headers in order to be able to create advanced custom anti SPAM filters (not just based on common subjects and source IP addresses).

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Actually the headers belongs to Mail Messages. Optional headers are usually added by SMTP and relay servers to the original message, but those are related to individual server/technology. The standard definition of Internet Message Format is described in the RFC 2822 in which you can find the standard fields. Here a link to RFC2822

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