Authentication attempt from to has failed with error .

Details
Product: Exchange
Event ID: 1011
Source: POP3SVC
Version: 6.5.6940.0
Component: Microsoft Exchange POP3 Service
Message: Authentication attempt from <name> to <host name> has failed with error <text>.
   
Explanation

This event indicates that when a POP3 client made an attempt to access a mailbox on the Exchange server, the attempt failed because of a logon failure. The error 0x52e translates to ERROR_LOGON_FAILURE. This error occurs because the value in the User Logon Name (Pre-Windows 2000) box does not match the value in the Mailbox Alias box.

   
User Action
  • Verify that the Mailbox Alias value and the User Logon Name (Pre-Windows 2000) value match
  • Enter the logon credentials in the format

    DomainName\LogonName\MailboxAlias when you are connecting through POP3.

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