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how_to:vpop3_re-downloading_old_messages_from_isp_pop3_server

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how_to:vpop3_re-downloading_old_messages_from_isp_pop3_server [2011/11/21 14:14] – created paulhow_to:vpop3_re-downloading_old_messages_from_isp_pop3_server [2013/05/28 08:47] – [SRVRUIDL.DAT in use by another program] paul
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 With recent versions of VPOP3 you can tell if this has happened by looking at the 'Received' headers of the message. The line which the VPOP3 POP3 collector adds shows the UID in the header line (UIDL=....), and you can compare the downloaded copies of a particular message. If the UIDs are different for the same message, then the ISP has re-assigned the messages' UIDs, so VPOP3 sees all the messages as ones it has not seen before With recent versions of VPOP3 you can tell if this has happened by looking at the 'Received' headers of the message. The line which the VPOP3 POP3 collector adds shows the UID in the header line (UIDL=....), and you can compare the downloaded copies of a particular message. If the UIDs are different for the same message, then the ISP has re-assigned the messages' UIDs, so VPOP3 sees all the messages as ones it has not seen before
 +
 +=====SRVRUIDL.DAT file being deleted===== 
 +If the SRVRUIDL.DAT (or SRVUIDLx.DAT) file gets deleted from the VPOP3 directory, this will make VPOP3 forget which messages have been previously downloaded, as that is where VPOP3 stores that information (up to VPOP3 version 4).
 +
 +This problem will not happen in VPOP3 version 5 or later as this information is now stored in the main database.
 +
 +=====SRVRUIDL.DAT in use by another program=====
 +If the SRVRUIDL.DAT (or SRVUIDLx.DAT) file is in use by another program (eg a virus scanner or backup program) at the time when VPOP3 wants to use it, then VPOP3 will not be able to open the file, so will download the messages again (up to VPOP3 version 4 only). If this happens, then the VPOP3 administrator will receive a message about the file not being accessible.
 +
 +This problem will not happen in VPOP3 version 5 or later as this information is now stored in the main database.
 +
 +There is no easy way to find which other program has the file open, because Windows does not report this information to VPOP3 - all it says is that the file is in use by another program, so VPOP3 cannot access it. 
 +
 +Things to try are:
 +  * make sure that two copies of VPOP3.EXE are not running
 +  * make sure that a backup program is not copying the file(s)
 +  * make sure that a virus scanner is not scanning the file(s)
 +  * make sure that someone hasn't decided to open up the files in a text editor/etc
 +  * you can try using a program such as [[http://technet.microsoft.com/en-gb/sysinternals/bb896655.aspx|Handle]] to see what the other program is - but this only works if the file is held open by the other program for a long time. If it is just opened for a few seconds, then you will have to be very lucky to catch it when it has the file open
how_to/vpop3_re-downloading_old_messages_from_isp_pop3_server.txt · Last modified: 2018/11/14 10:45 by 127.0.0.1

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