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Event ID: 1070 Source: Pop3Connector

An attempt to relay e-mail to recipient [email protected] was made. The e-mail could not be delivered because the recipient's e-mail domain name does not match any local e-mail domains.
As per Microsoft: "This issue may occur when the Windows Small Business Server 2003 Connector for POP3 Mailboxes component downloads e-mail messages from a domain that is not found in the Microsoft Exchange Server 2003 organization default recipient policy. You may experience this issue when you configure a POP3 account with a domain that is outside your Exchange organization. For example, when the POP3 accounts use the e-mail domain address, and the Exchange default recipient policy does not include, the Connector for POP3 Mailboxes does not deliver the e-mail messages that it downloads from the Internet Service Provider (ISP). This issue may occur when the address on the POP3 e-mail message does not match any one of the addresses in the default recipient policy. In this case, the connector detects the message delivery as an attempt to relay the e-mail message to an external e-mail server and does not deliver the message". See MS KB ME842293 for more details.
Check ME300681, maybe it can help you.

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