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If you download the same messages over and over, the first step would be to make sure that you do not have "Save a copy of messages on server" selected in your mail client's options. If this option is selected, you will find that you do download the same messages time and again. The most common cause for this problem, however, is one message that clogs up your mail, so to speak. There are quite a few lines that most people do not see while sending mail called, headers, and this is what actually directs where the mail is delivered to. If there is any character out of place in the header, the message will be undeliverable. Or if the message is too large for the mail server to handle the result will be the same. This single message will prevent anything else from being downloaded after it. Until the very last message on the server is downloaded, the server will continue giving you the same messages. So if you are stopping the download of mail yourself before it is finished downloading, it will start from the top the next time you try. After the final message is downloaded, that is when the server wipes the slate clean for you.
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