Using signature headers to determine if an email has been forged

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Domain Key Signatures

These headers, included by the mail server, provide a signature of each message. See Gmail Header Format. The public keys are distributed via DNS.

Signed mail

Some other programs can be used by the sender to sign an email message. Programs such as PGP, GnuPG.

See Also

• Using message id headers to determine if an email has been forged