Windows Server SBS 2011, running Exchange Server 2010:
Our client has their own Exchange e-mail accounts, but also some old POP3 accounts which are hosted somewhere else but are still in use. So we use the POP3 Connector to pick up those e-mails and deliver them to the correct mailbox. One of these mailboxes is throwing errors at us:
One or more (2) e-mail messages in the POP3 mailbox account '(...)' on the POP3 server '(...)' have invalid header fields. Because of this, the messages cannot be delivered to the Exchange Server mailbox '(...)' in Windows Small Business Server. The messages are still on the POP3 server. To resolve this issue, connect to the POP3 mailbox account, and then manually retrieve or delete the messages.
So I did as the error message said, I logged into this POP account with Outlook and deleted the 2 e-mails. However I still keep getting these error messages. All the Exchange and POP3 services have been restarted, the POP3 connector log has been cleared, the server has even already been rebooted but this message keeps popping up every 5 minutes. So it looks like the POP3 connector is trying to pick-up e-mails that don't even exist anymore... Any way to get rid of this error message, or even better: fix the issue? Thanks.