In step 201, the tag extractor 121 extracts all HTML tags from an e mail in {HEAD ~ the plurality} of {TAIL ~ e mails} 
In step 201 , the tag extractor 121 extracts all HTML tags from an e mail in { HEAD ~ the plurality } of { TAIL ~ e mails }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL