Thunderbird does not delete messages from the POP server.

I am a Yahoo Plus user and I can download messages from the inbox in Thunderbird from the Yahoo POP3 server.

However, I want to delete read messages directly on the email client rather than go to Yahoo mail. When I do this, emails are still on the server

In accounts setting, I have the following options ticked:

-Automatically download new messages -Leave messages on server, Until I delete them

Thanks for any guidance

Update: Thanks for the replies so far. Some clarification: I do want to keep some messages on Yahoo for filling them in my online folders, hence the reason I do not download ALL my messages to Tbird and delete server message automatically

**Update 2: Cracked it!! OK, boys and girls, here is the way to do it. Go to Options-> Advanced -> Config Editor find the Name 'mail . pop3 . deleteFromServerOnMove' Set it to True True: Delete the copy of the message on the POP3 server if you move or delete the message. False(default): Only delete the copy of the message on the POP3 server if you delete the message. That's it, restart Thunderbird. You need to press 'Get Mail' everytime you want to sync with the email server, in order for you to make sure messages in the application is in sync with the email server.**