Unable to send emails on Outlook

Copper Contributor

Hi all please assist. I keep getting this message on my new outlook email.  I am a small business owner and as sush, I do not have an IT admin to refer to. It all falls on me 

 

the message I get on my outgoing  emails is 

 

“Delivery has failed to these recipients or groups:Your message wasn't delivered because the recipient's email provider rejected it.”

 

I have received emails however when I reply or send new ones, I get that message back. 

thanks for the help 

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