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