If there is an existing directory for the signature key, {TAIL ~ the signature key generator} 123 simply stores the e mail in that directory in {HEAD ~ step} 206 
If there is an existing directory for the signature key , { TAIL ~ the signature key generator } 123 simply stores the e mail in that directory in { HEAD ~ step } 206
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH