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Why does Outlook keep receiving duplicate messages?

There are a couple of situations which may cause Outlook to download duplicate messages:

1. Outlook Downloads Messages from a POP3 Server Twice

—>  http://support.microsoft.com/default.aspx?scid=kb;en-us;292249

2. Mail Retrieval Problems Occur When You Receive POP Mail

—>  http://support.microsoft.com/default.aspx?scid=kb;en-us;317945

3. Password Prompt, Duplicate Messages Appear If Outlook Profile Has Two POP3 Accounts

—>  http://support.microsoft.com/default.aspx?scid=kb;en-us;284404&Product=ol2002

4. POP3 Headers Are Duplicated

—>  http://support.microsoft.com/default.aspx?scid=kb;en-us;289942&Product=ol2002

5. You are Using Anti-Virus Software Many anti-virus programs can cause this issue as well. If the message is large, the software causes a ‘timeout’. As a result you recieve the message over and over.

How can I stop this situation? The easiest and fastest solution to this problem is to log-in to the mail server and delete your mail message that is causing the problem – or all of them for a fresh start. (NOTE: make sure that you have downloaded your messages first)

Other things to prevent duplicate emails:

1. Increase your server timeout settings to 10 minutes:

–  Tools|E-mail accounts View or change existing e-mail accounts

–  Select the account corresponding to your account Click the Change button.

–  E-mail Accounts More Settings Internet E-mail Settings Outgoing Server My outgoing server (SMTP) requires authentication Use same settings as my incoming mail server

–  Advanced Outgoing server (SMTP): 25 This server requires a secure connection (SSL) Server Timeouts (Increase from 1 minute to 10 minutes)

2. Configure Outlook so as not to check e-mail more frequently than ten minutes.

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