After applying the 8.0.2 update, administrators may receive POP3 Connection Error reports with the following detail:

last request failed

This email is sent when an error occurs during the connection and importing process form your email server. It typically indicates a connection or authentication problem.

A change in the email handler library has resulted in less detailed error messages

A hotfix has been created for 8.0.2 only to provide more verbose error details to facilitate issue identification:

https://whmcs.community/files/file/142-core-15516-more-verbose-pop-cron-logging-last-request-failed/