This is an old revision of the document!
To delete messages from the VPOP3 'OutQueue':
Note that you cannot delete items from the VPOP3 OutQueue whilst VPOP3 is in the process of sending them, so you should stop VPOP3 from sending first.
If there are too many messages in the outqueue and you cannot delete them using the above method, you can delete all the messages them the 'backdoor way'. To do this, stop VPOP3, then delete all the Q*.DAT files in the VPOP3\Outqueue directory, then restart VPOP3. (Note that doing it this way, you can't be selective about which messages you delete).
If you want to save some messages, you could move the Q*.DAT files into another folder on the disk, then move them back in smaller chunks, deleting the unwanted messages as you go.
If the messages are in the outqueue due to a problem of some sort, it can be worth keeping some of the Q*.DAT files for diagnostic/forensic purposes.