User Tools

Site Tools


how_to:duplicated_messages

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revisionBoth sides next revision
how_to:duplicated_messages [2015/09/23 13:46] – external edit 127.0.0.1how_to:duplicated_messages [2017/01/16 10:20] paul
Line 32: Line 32:
 =====Multiple Copies of VPOP3 running===== =====Multiple Copies of VPOP3 running=====
 Using the **Processes** list in Windows Task Manager, make sure you do not have more than one copy of **VPOP3.EXE** running. (Click on the **Show Processes for all Users** button/box if there is one). Using the **Processes** list in Windows Task Manager, make sure you do not have more than one copy of **VPOP3.EXE** running. (Click on the **Show Processes for all Users** button/box if there is one).
 +
 +=====Internal messages being received multiple times=====
 +Some email clients (eg Microsoft Outlook) will silently resend messages if they don't receive a response from the mail server soon enough. This can lead to it resending a message many, many, times. This is most likely to happen with large messages and/or messages to many local recipients, because of the time taken to process these messages.
 +
 +To try to alleviate these problems, some things to check are:
 +  * make sure that VPOP3 is working as fast as it can - eg by regularly defragmenting the VPOP3 server hard disk (unless it's an SSD).
 +  * check any virus scanner on the sender's or VPOP3 PC. If that is checking SMTP (outgoing) messages, then that can add a substantial delay to sending large messages.
 +  * increase the timeout in Outlook (in the email account's 'Advanced' settings). The default is 1 minute, even though the SMTP standards say it should be at least 10 minutes.
 +  * if the problem is when sending to a large number of local users, then consider using a Mailing List in VPOP3 instead of a distribution list or just CCing lots of people. VPOP3 processes Mailing Lists in the background so it responds to the email client much quicker.
  
 =====Other causes===== =====Other causes=====
how_to/duplicated_messages.txt · Last modified: 2018/11/14 10:45 by 127.0.0.1