@emirc

Locate the file vendor->uvdesk->core-framework->Services->EmailService.php.

Open the EmailService.php reach to sendMail() function.

and dump() the exception as in attached images.

dedafd32-9014-4572-a764-cbef712503de-image.png

4fee59e9-8a59-4ad4-a20c-c54af323b192-image.png

It will show the error you are facing while sending mails (if adding an agent, creating a ticket etc).

Other helpful link:

https://forums.uvdesk.com/topic/1870/how-to-debug-the-error