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.
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.....!