Gnus is able to verify signed messages or decrypt encrypted messages. The formats that are supported are PGP, PGP/MIME and S/MIME, however you need some external programs to get things to work:
More information on how to set things up can be found in the message manual (see section `Security' in Message Manual).
mm-verify-option
never
, not verify;
always
, always verify; known
, only verify known
protocols. Otherwise, ask user.
mm-decrypt-option
never
, no decryption;
always
, always decrypt; known
, only decrypt known
protocols. Otherwise, ask user.
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