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SBS2000 with Pop Connector : Mails are leaving the POP3 server, but not arriving in the mailboxes....They seem to disappear...HELP

The Setup:

5 domains registered to 1and1.co.uk, on each domain webspace and pop3 mailboxes are stored.

Each domain has a "mailcatcher" account to which all emails for that domain are forwarded on the pop server :  *@domain.co.uk -----Forwards-----> Catchall@domain.co.uk.  The 5 catchall account details are in the pop connector on the exchange server which connects and downloads emails every 15 minutes. These emails are then sorted by the virtual smtp server on the local domain and sent to the appropriate mailboxes.

This setup has been up and running fine for a couple of years, the 5th domain being added in the few months.

The Problem:

All was working oka until this week, perhaps earlier, it's hard to tell.  All mail for the 5th and most recent domain disappears as soon as the POP connector scoops it from the POP3 server.  Internal emails are sorted fine, but any emails from the internet reach the catchall account, sit there until the exchange server connects and downloads them and then they disappear, never reaching the mailboxes.  CC'd recipients to the 4 other domains are delivered successfully.  Also, if you reply to a sent email on the 5th domain, it DOES get delivered.  There are no queues with mail waiting or non delivery reports. I've tried automatically forwarding emails from the target mailbox to mine, and this works, only if I copy in myslef on the emails, ending up with 2 identicle emails being delivered to my mailbox and none to the target mailbox.
I have also restarted the mail services on the exhange server, and  recreated several of the mailboxes, to no avail.

 I'm at a loss a to what to try next.

The most recent change I've made to the exchange server has been to add GFI mail essentials on trial, but I don't think this has anything to do with it; it hasn't affected any other domains and I've set it to move spam to subfolders rather than delete.

Please help, my brain hurts.....!

1 Solution
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Well, first of all you need to realize that the POP3 Connector is not intended to be a permanent solution.  It's been offered with SBS as a way to assist businesses in transitioning to SMTP Email and having the Exchange Server receive messages directly.  

There could be a number of reasons that this is happening, and the main KB Articles about it are here:


The rest of the KB articles on this subject are listed here:

One thing that can also cause problems is if the mailboxes at each different domain have the same username, ie user@domain1.com and user@domain2.com or user2@domain1.com and user2@domain2.com.  This is because the Exchange POP3 Connector actualy strips off the domain name from the recipient address in order to match it up with a user's alias in Exchange.

You really should consider having your Exchange server receive the messages directly when using multiple domain names.  See http://sbsurl.com/pop2smtp for the steps needed to do this.

MahoolahAuthor Commented:
Thanks that's great advice....I'm currently investigating all of the a above.
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