Hi All,
Require some help if possible.
Migrated a company from a 3rd party exchange provider over to our own internal exchange.
Users are now unable to edit or change calendar items that existed prior to the migration, a bounceback is below.
They have full permissions over the calendars, this has been confirmed and rechecked. I know this for certain as new items can be created.
The bounceback I see is like below:
Delivery has failed to these recipients or groups:
Test@externaladdress.co.uk You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission. If the problem continues, please contact your helpdesk.
Diagnostic information for administrators:
Generating server:
test@externaladdress.co.uk #MSEXCH:MSExchangeIS:/DC=local/DC=uptime:USEXMB2[578:0x000004DC:0x0000001D] #SMTP#