Why are we seeing Application Errors with the "No POP3 greeting from mail server" message?
Application Error Notifications
The Application Errors with the "No POP3 greeting from mail server" message is referring to mailboxes that are not Oracle-hosted mailboxes, that are hosted on your own servers. This type of error is a result of our techmail utility not being able to communicate with your mail server where the mailbox is hosted.
It is recommended that you contact your mail administrators to confirm that there are no communication issues between your server and the Oracle Service Cloud techmail utility.