BlackBerry :: How To Purge Learned Email Addresses

Somewhere in my Blackberry's email program is a function that remembers the email address of anyone who sends me an email. Does anyone know how to purge this information?This feature has an unintended side effect of creating confusion when I compose an email message to someone in my contacts list, in that sometimes the remembered name of someone with the same name but a different email address pops up first, and if I am not careful, I can end up sending an email to the wrong person.The problem is worsened by the fact that there is some malware out there that has gotten hold of my niece's address books and sends me spam with the names of people I know using bogus email addresses on Yahoo, and the email program offers these names when I am composing a message, sometimes before the contact record for the person I want to email to. For example, I have received a message sent by y5e4dd645c17c@yahoo.com using my daughter's name (let's call her Jane Smith). Even though this email address is nowhere in my contacts, when I start to compose a message to Jane Smith, the autocompletion shows two Jane Smiths, and I have to carefully check to ensure the address being used is janesmith@someserver.com and not the bogus address above