When enabling mail forwarding in ODME for Zimbra, during the migration you see the following error:
"Attempting to set forwarding address usermail@maildomain.com on source mailbox usermail@maildomain.com. The remote server returned an error: (500) Internal Server Error.(The remote server returned an error: (500) Internal Server Error.)"
Zimbra Admin account used for migration may not have sufficient privileges to make change on the source mailbox and set the forwarding.
For Zimbra admin account review Class of Service and Features whether forwarding is enabled or not.
Please see this link (external) for some more details for Class of Service
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