Detect Your Unprocessed Inbound Emails
The records that are read from the email server are stored as records in the database table of your service application. The Detect Unprocessed Emails scheduled process checks the status of the records in the email server from the time that it starts.
It compares the data between the email server and the database tables of your service application. It then identifies the unprocessed records. Every time it runs, it starts checking from the first remaining unprocessed record.
Some emails may be present in the email server, but they may not have reached your service application because the application is down or because of some other issue. Every time the scheduled process runs, it checks the status of these pending emails, starting from the first remaining pending email. After a certain specified time limit, if a pending email has still not reached your service application, it will remain unprocessed.