I am listmom of a newsletter and I get thousands of bounce mail messages in my in box. Recently I couldn't load mail, because it got hung on one of them. After every known trick, I just logged into that same pop server with a Panther-based mac, and it handily loaded in 27,000 messages.
Tiger said there were only 18,000, and despite preferences to the contrary, it wasn't removing messages from the server, even when I manually asked it to.
I copied that mbox onto an external firewire drive, and sneaker netted it over to the TIger machine. I imported the mailbox (several hours) and then tried to apply my rules to it. I "evaluated messages" for a while, then just stopped. I tried again, and it acted like they were all sufficiently evaluated. I have 20+ rules to file mail into as many folders.
NOW< I'm trying to just MANUALLY delete the bounced mail messages. They are the lion's share of the folder.
I sort by subject, and they all stick to gether. I highlight the first one and shift click the second and hit delete. After a long time of "Sorting", "Updating color" and so on, they disappear.
I click on another mailbox, then back on that one, and they're baaaaack.
So, I created a smart mailbox from my search, which ended up being. "mailbox= imported & subject includes "Undelivered"" that mailbox has 17k messages in it and I selected them all, and hit delete (again.) then they disappeared.... and reappeared.
I can delete half at a time, or whatever and they just won't go away. this is a 2 day old install of Tiger, and a brand new mbox fresh from import.
I think Mail 2.0 has is more like New Mail 1.0 and has lots of bugs.