Application event log errors

We are receiving lots of error in application event log in Windows SBS 2003.

Error 2007-10-04 11:06 POP3 Connector Download 1019
Error 2007-10-04 11:06 POP3 Connector Download 1023
Error 2007-10-04 11:06 POP3 Connector Download 1036
Error 2007-10-04 11:02 POP3 Connector Download 1023
Error 2007-10-04 11:02 POP3 Connector Download 1036
Error 2007-10-04 11:02 POP3 Connector Download 1023
Error 2007-10-04 11:02 POP3 Connector Download 1036
Error 2007-10-04 11:01 POP3 Connector Download 1023
Error 2007-10-04 11:01 POP3 Connector Download 1036

Daily we are receiving these errors lots.

How to control these errors?