"Unfortunately, Jira Service Management couldn't connect to the mail server" error in Outlook

Summary

Fix the error, "Unfortunately, Jira Service Management couldn't connect to the mail server. Here is what the mail server said: "STAT command failed: Exceeded the login limit for a 15-minute period. Reduce the frequency of requests to the POP3 server."

Solution

Jira Service Management checks email accounts every minute. Microsoft Outlook might suspect inappropriate usage of this account and lock it for security reasons. To resolve this, use IMAP instead, or reconnect with OAuth by clicking on the Microsoft logo.

To learn more about how Jira Service Management processes incoming email requests and things to keep in mind, see How does Jira Service Management process email requests?