forming a fingerprint of the e mail by linking together {HEAD ~ the extracted HTML tags} to form {TAIL ~ a single string} 
to form
forming a fingerprint of the e mail by linking together { HEAD ~ the extracted HTML tags } to form { TAIL ~ a single string }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL