Police are warning Sydneysiders to be vigilant after uncovering a sophisticated mail fraud scam that netted more than $250,000 from 57 individuals and a number of corporate groups. The fraud was uncovered by Strike Force Deary earlier this month. The fraud syndicate allegedly stole mail, ported mobile phone numbers and tricked employees into giving out identifying information to open bank accounts and take out credit cards in the names of the alleged victims.