Change the "From" address

[txsrooster]

I was given the option at work to get a blackberry or have them pay for my own cell service...I chose for them to pay my cell service and have the TP. The great thing about the crackberry is the email from our office is sent directly to the phone. I got around this with the mogul by setting up a personal email account and forwarding all the emails to there and downloading them on the mogul. I could change the sent from email address to look like my work email address. For some reason on the TP it will not send emails this way and gives me an error. Anyone know of a way around this...I don't wont them to force me into a blackberry.