This may be helpful.
You can view email queue and see Whether your email has been added to the queue and see the details.
Login as administrator and open : https://example.com/desk#List/Email%20Queue/List
This may be helpful.
You can view email queue and see Whether your email has been added to the queue and see the details.
Login as administrator and open : https://example.com/desk#List/Email%20Queue/List