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Event ID: 4017 Source: POP3Connector

We have been denied access to Hostname[IP_address] logging as Username. Verify the password for the account.
As per Microsoft: "The POP3 Gateway connector is not case sensitive and converts all account information to lowercase letters. If the POP3 host from which mail is to be downloaded requires uppercase characters for user names, the POP3 host denies access". See ME243587 for a workaround on this issue.
As per Microsoft:"These events may be logged for any type unsuccessful authentication, including incorrect password, incorrect username, incorrect password and username combination, or if another session is locking the mailbox. This error may also be logged if you disable the POP3 account." For more information see ME279985.

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