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Clients Re-download all POP3 messages after a server upgrade

Posted on 2009-07-03
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Last Modified: 2013-12-18
Hi,
We upgraded an old email server to Icewarp Merak 9.4.2 , and now all pop3 clients are re-downloading all of their messages that is stored on the server. Is there a way to prevent this? thanks.
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Question by:eggster34
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kevin_u earned 500 total points
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1) clients don't have to "leave mail on the server".... but thats a client choice.

2) The problem has to do with something called a UIDL
It identifies how messages are uniquely identified by the client and the server.
When you changed servers, the UIDLs of each message changed.  So the clients thing all the mail is new.

In Dovecot, which I'm familure with, there is a specific feature that helps work around the probmem:

Here are the comments from dovecot:
  # POP3 UIDL (unique mail identifier) format to use. You can use following
  # variables:
  #
  #  %v - Mailbox's IMAP UIDVALIDITY
  #  %u - Mail's IMAP UID
  #  %m - MD5 sum of the mailbox headers in hex (mbox only)
  #  %f - filename (maildir only)
  #
  # If you want UIDL compatibility with other POP3 servers, use:
  #  UW's ipop3d         : %08Xv%08Xu
  #  Courier version 0   : %f
  #  Courier version 1   : %u
  #  Courier version 2   : %v-%u
  #  Cyrus (<= 2.1.3)    : %u
  #  Cyrus (>= 2.1.4)    : %v.%u
  #  Older Dovecots      : %v.%u
  #  tpop3d              : %Mf
  #
  # Note that Outlook 2003 seems to have problems with %v.%u format which was
  # Dovecot's default, so if you're building a new server it would be a good
  # idea to change this. %08Xu%08Xv should be pretty fail-safe.

Perhaps there is a similar configuration item in Icewarp Merak 9.4.2??

Hope this helps.
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by:eggster34
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ok thanks.
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