Okay, started off with some simple procmail filtering on my main account. It has been a while since I’ve used it. But I got tired of my desktop being off while I was traveling and not having Thuderbird do the filtering for me.
The one incompatibility I have is that I want to keep unfiltered email in ‘/var/spool/mail/<username>’ such that it then shows up in my Inbox for both Thunderbird and the iPhone.
I guess I’ll add a dummy account and see if I can get it to do that with procmail.