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Why I am receiving the following error when sending an email: “553 sorry, that domain isn in my list of allowed rcpthosts”?

April 26, 2017allowed domain email Error list sorry

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Why I am receiving the following error when sending an email: “553 sorry, that domain isn in my list of allowed rcpthosts”?

1 Answer

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For security reasons (including spam control), you must receive email using the POP or IMAP protocols before sending any email. When you use POP or IMAP you are authenticating a user; then this user is allowed to send mail to unknown hosts. After you receive mail using the POP or IMAP protocols there is a 30-minute window that the user is authenticated for. If you send mail after that 30-minute window you will receive the error above.