Can Thunderbird 3 do this?

by ecnerd09 - 1/7/11 8:44 PM

Ok, this is what I want Thunderbird 3 to do for my email account that I have set up using IMAP protocol, but I cannot seem to find a way to do it or if it is even possible for IMAP:

I want Thunderbird to ignore what happens to messages that X days old. So, if I delete a 30 day old message, it will only be moved to the trash on the local machine and not on the server.

Based on what I've read, this is inherently impossible with IMAP, but I figured I might leave it up to you guys before I consider this a lost cause.