Fluent SMTP-SMTP Error: The following recipients failed

I no longer receive emails when new users registers on my site and they also dont recieve emails. I get the following error:

SMTP Error: The following recipients failed: [email protected]: “Your IP: aaaaaa : Your domain aaaaaa.co.za is not allowed in header From”

I used (aaaaa) to hide my info , i dont know if it’s personal or… please help me

 

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