Email Error 551

551 email error is normally encountered when there is an attempted delivery to a mail server that doesn't handle mail for the specified recipient.

You should receive a bounce-back message from the server with a variation of email error 551. The fix would be that the email address is entered incorrectly and needs to be re-entered correctly, or that the email account isn't set up correctly on the recipient's server and they need to resolve it themselves.

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