Mailhandler returns NULL event

[Stefan Lorenz]

We have configured Service Desk with an incoming Email. This has worked flawlessly for 8300 Tickets so far. 

Since the upgrade to JSD 4.01 everytime when a customer replies to a ticket the mail handler goes into a everlasting loop of adding the comment to the ticket. 

The comment is added every minute and the mail handler protocol shows:

FEHLER

Mailhandler hat ein NULL-Ergebnis zurückgegeben.

sender

summary

Service Desk-Mailhandler

[Brant Schroeder]

Your issue sounds similar to this - https://community.atlassian.com/t5/Jira-Service-Desk-questions/Jira-Service-Desk-Incoming-Mail-Handlers-Not-Running/qaq-p/740945