New email account not working

My employers have just opened me an em client email address but i am unable to send emails. they are stuck in the outbox. I have no idea whats wrong and my employers have no idea either. can anyone help please?

Hello Cassandra,

Can you please provide a screenshot of this error? The photo you included is taken with a camera and as a result the error message is unintelligible.

Thank you.

-Dave