Mail Handlers incoming mail failed even the gmail inbox has the new email

[Indy W]

The Jira mail handlers is not working starting from 14 Nov. Originally it is working normally, now, starting from 14 Nov, even there are new coming email in the gmail inbox, the work item is not created and when I run the test, it pops up "No messages were found in this mailbox. To properly test this handler, populate your mailbox with a few emails first and re-run the test."

I did not find any other error message on that, the Mail Handlers incoming mail does not work suddently