Im desperate. The General Manager of our company is receiving these error messages when sending emails. He aparently receives mail ok, but when sending:
The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient.
He uses OWA to connect and work.
From this error message, im lost as how to start troubleshooting. Any help is appreciated.