You could try the GMail app?
It really is very full-featured. You can forward all your mail to the GMail account, and GMail has an option where you can send mail from their servers but have it appear like it's being sent from a different email address. Like if you have a hotmail account, everyone receiving emails from you would still think they were getting them from that email address.
How do I put all my e-mail accounts to Gmail? (Step by step, please)?
I have Live mail, and Roadrunner.
Already have Gmail on my Droid.