MailTrasher for Mac

From Vechtwijk Automatisering:

MailTrasher gives you the ability to trash the entire contents of your POP3 mailbox without downloading each message first. This can be essential if you keep backup copies of your e-mail in a mirrored account (for instance a web account). Occasionally you want to clean out those mirrored accounts to avoid running out of storage space. Instead of having to download each message first, MailTrasher speeds up the process by deleting every message in the mailbox without the download procedure. One click and they're gone forever!