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