Your email software has more than one "Account" or "Profile" or "Personality" configured to download messages from the same email POP account. As a result, your software downloads one copy for Additionally, The "time stamp" on each message may be slightly different, but this is not always the case. The sender actually is mailing multiple copies, possibly due to a software problem on their system or server. The "Message ID" for each email (contained in the Internet Delivery Headers) is unique, even though the message itself is the same. navigate here
The result is that every time you connect duplicate copies are retrieved of just certain emails, or of all emails older than some specific date, while newer emails are downloaded just Solution: Contact either the sender or their ISP/Host and make them aware of the problem, providing as much information as possible, such as: Dates, Time, Subject Lines and the Message IDs. Symptom: You receive two or more copies of messages from some senders, but not others. Symptom: All email from all senders are downloaded two or more times; but only up to a certain number of copies, which remains the same… ie: two copies of every email https://support.microsoft.com/en-us/kb/2685726
Symptom: In this situation your software program loses track of the emails that it has already downloaded. In either case the original date and message ID contained in the email's Internet Delivery Headers will be identical for each copy. Your email software may have corrupted files (most common with Outlook & Outlook Express) which prevents it from successfully downloading and deleting messages from the mail server.
OnlyMyEmail Anti-Spam Blog Discussion of all things pertaining to Email and Spam Control HOME | SERVICES | ABOUT US | RESELLSERS | FAQS Solution: Manually review each Account/Profile/Personality within your email software to make sure that the same POP account isn't listed more than once. 2. Solution: Log into the Web-mail interface (if one is available for your mail server) and manually move or delete any messages that are being downloaded repeatedly. Duplicate Emails In Outlook 2007