Event ID - 11300

Event Id11300
SourceMSExchange Pop3 Interface
DescriptionAn unauthenticated POP3 client 157.57.149.23 issued the following command: AUTH .
Event InformationAccording to Microsoft:
CAUSE:
The client is trying to use Secure Password Authentication and it is not enabled on the Exchange Server computer. To verify what form of authentication the Outlook Express client is using, in Outlook Express, on the Tools menu, click Accounts, and click the Server tab for the account that failed.
WORKAROUND:
To work around this problem, enable Windows NT Challenge/Response authentication on the server for clients that want to use Secure Password Authentication, or use the Log on using option in Outlook Express.
Reference LinksPOP3 Outlook Express error: 0x8000CCC18 and Exchange Server

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