Signup confirmation emails stoped working

Hi,
My project was working fine until some hours a go, my app's users stoopped receiving confirmation emails

I checked the services status it said that the problem has been solved.. but it is not on my side

i checked my smtp logs and here is what the error says
Sending has been rejected because the sender you used noreply@domain.com is not valid. Validate your sender or authenticate your domain
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