Auto forwarding for Mails from Zimbra not working for C4C

Hello All,

Request your expertise on the issue that we are facing currently. We have Zimbra mail server on which auto forwarding is enabled for the support ID's.

Whenever we try sending a mail to these support ID's, we are getting an Application error at the C4C end.

Sending mails directly to C4C ID's from these support ID is working but auto forwarding via these support ID's is showing up an error.

Request helpful pointers on the same.