DS lookup for user , connecting from , failed with error .

Product: Exchange
Event ID: 1022
Source: POP3SVC
Version: 6.5.6940.0
Component: Microsoft Exchange POP3 Service
Message: DS lookup for user <user name>, connecting from <host name>, failed with error <error code>.

This event indicates that when a POP3 client made an attempt to access a mailbox on the Exchange Server, the attempt failed because lookup of Active Directory for that user failed.

This behavior 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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