The method 200 may be performed for {HEAD ~ each e mail} in {TAIL ~ the plurality} of e mails, resulting in e mails with the same fingerprint being grouped together in a particular signature key directory 
in
The method 200 may be performed for { HEAD ~ each e mail } in { TAIL ~ the plurality } of e mails , resulting in e mails with the same fingerprint being grouped together in a particular signature key directory
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH