I would like to be able to send from an email address (e.g. jim@jim.com), have all of the email sent to that same address (jim@jim.com), and not get double downloads of the message from my email client (Mail.app).

So if I get an email to jim@jim.com, I want it forwarded to jim@jimmy.com. I use the email forwarder...no problem...works great.

If the account jim@jim.com is not "active" in Mail.app, then I cannot send mail from that account, but if it is active, then I get the same message downloaded twice, once on the jim@jim.com and once at the jim@jimmy.com where it was forwarded to.

How do I solve this problem? I want to send from an email address but not get incoming messages downloaded twice b/c of the email forwarder.