[exim] accepting email authenthicating on GPG/PGP signature

[Leonardo Boselli]

Is possible to authenthicate the acceptance of e-email based on the GPG 
signature, that is every message has a GPG signature, if the message 
is signed by someone that is in the public keyring of MTA, and the 
gignature is verifiesm, it is accepted, else is refused ?

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Leonardo Boselli
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