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Event ID: 1072 Source: Pop3Connector

There is no delivery information for Microsoft Connector for POP3 Mailboxes to use in routing the message <id: {<ID>}>. Either the message used a blind carbon copy (bcc) or a distribution list when it was delivered to the POP3 account at the ISP or the e-mail domain specified for the global mailbox is incorrect. The message will be delivered to the Exchange mailbox <mailbox> as specified in the POP3 Connector Manager. For information about using routing rules to deliver e-mail from a distribution list or global mailboxes see Help.
I had this exact problem on a client SBS 2003 Server. It occurred in situations where the SBS server used the POP3 connector to download mail from a GLOBAL ISP mailbox. In this scenario when someone tries sending an email to a recipient on the SBS Exchange server using the BCC (blind carbon copy field), the message header information is removed before reaching the Exchange server and therefore the email cannot be delivered. The solution is to contact the sender of the emails and tell them to stop using BCC. It is apparently a limitation of the POP3 protocol. See ME265739 for details.

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