I am unable to send my email to my brothers from outlook

usman mushtaq 0 Reputation points
2023-11-06T17:58:47.1033333+00:00

I am not being able to send my email to my brother.

Sender email is fine and it always giving me postmaster failure

and it is saying that

" Your message wasn't delivered because the recipient's email provider rejected it "

What should I do

Outlook
Outlook
A family of Microsoft email and calendar products.
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