Error email failed, spoofing not allowed

[FoxSecrets]

I'm getting the error below when forum tries to send email.
How can user email match forum email? I didn't get that, non sense... Can someone explain what's going on? How to fix that?

Code:

Swift_TransportException: Email to [email protected] from [email protected] failed: Expected response code 250 but got code "550", with message "550-Your FROM address ( [email protected] , Fox 550-<[email protected]> ) must match your authenticated email user ( 550 [email protected] )...

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Error email failed, spoofing not allowed

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