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