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  3. Why do I get a "553 Sorry, that domain isnt in my list of allowed rcpthosts" error when sending mail?

Why do I get a "553 Sorry, that domain isnt in my list of allowed rcpthosts" error when sending mail?

You do not have SMTP authentication enabled in your mail client. Instructions for configuring your mail client are available here.

Troubleshooting GIP Shared Hosting Email