security with email data entries

Hi group! i have this script to read data in POP emails and put them in a database. I would like to know if anybody knows how people would try to get around the tests I've build in. - normal registration by web form (password scrambled), with confirmation through email response - the first header starting with 'From:' in the mail is scanned for a the email addtess and then i check whether the email address is in the database - the mail contains the non-scrambled username and password, which are also checked - there must be a magic word in the email subject (to prevent SPAM mail confusing my script) Oh and I intend only to disclose the email address to people i know. thanks, Chris -------------------------------------------------------------------- -- C.Hayes Droevendaal 35 6708 PB Wageningen the Netherlands -- --------------------------------------------------------------------