Log in to 1and1's webmail and remove the message that keep getting downloaded. It is possible that the pop session got interupted while downloading a batch of emails. Messages to be deleted are not physically removed until a successful disconnection by the QUIT command. If the POP3 session is interrupted, messages are not removed and the server downloads them again.
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by: sda100Posted on 2009-08-21 at 01:58:51ID: 25150027
You said you *think* Thunderbird is set to delete messages off the server. Can you confirm this? Can you also list all your POP3 options?