Originally Posted by NJBlackBerry
Search for a program called "BBReply"; it will let you dynamically change the Sent From e-mail address. That should do the job.
No, it doesn't.
It adds a "Reply-To:" header, which isn't at all the same thing as setting a From: header.
Nothing respects Reply-To: except email clients; if you regularly deal with people and want to represent different organizations or send things to mailing lists with different subscription addresses, you cannot do this on a BlackBerry.