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