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Reason: 551 This mail server requires authentication before sending mail from a locally hosted domain. Please reconfigure your mail client to authenticate before sending mail.

disable an options in mailenable

SMTP > security > enable address spoofing
untick this address spoofing

the error u see is come from recipient mail server
so u need to configure the recipient side

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One Response to “Reason: 551 This mail server requires authentication before sending mail from a locally hosted domain. Please reconfigure your mail client to authenticate before sending mail.”

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