SBS 2003 PoP3 Error in Eventlog

We are SBS 2003 Premium Edition,

Everyday, I am getting the error in Server EVENT LOG,

POP3 Connector
Download
Event ID 1019
The message download process finished with one or more errors.

POP3 Connector
Download
Event ID 1023
The downloading process for mailbox was ended with one or more errors.

POP3 Connector
Download
Event ID 1035
A error occurred in connecting to the POP3 server for user . The error is 11004. The server may be down for maintenance or your server is not connected to the Internet.

In our cases where the POP3 connector is used to download mail from an external POP account.

First of all check that the "Microsoft Exchange POP3" and "Microsoft Connector for POP3 Mailboxes" services are running. Also ensure that all the POP3 mailbox details entered into the POP3 Connector Manager are valid. You can test using a standalone POP3 client like Outlook Express or Mozilla Thunderbird.

Finally, for a detailed look into the problem, work through this Microsoft KB article .