best way to delete a message with IMAP?

[Amer Mallah]

I'm trying to figure out what the best way to delete a message with IMAP is. Here's my usage, someone tell me what I'm doing wrong:

"Mark it as deleted" - I do this, the X icon appears, but I can't seem to find an Expunge/Purge function anywhere in the mailer. When I exit it and come back, all my X icons have been reset and the mails are as good as new.

"Move it to the Trash folder" - I'm thinking this was meant for POP3. It seemed to be working all last night, but when I woke up this morning, everything I deleted last night was back.

"Remove it immediately" - I haven't tried this yet, but I don't want to remove it immediately, I would prefer it was just marked for deletion.

Any hints? tips? comments?

thanks!