cpanel Email Relay access denied [RCPT_TO]

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Hi im having a bit of a problem with a client. they have 8 email addresses setup on their domain. Yesterday they said they are not receiving any email. After checking the could send email to outside just file.they could receive email from internally same domain.

now you try to send email to any address on that domain i receive an error.

Sorry, we were unable to deliver your message to the following address.

Remote host said: 554 5.7.1 <>: Relay access denied [RCPT_TO]

how can i resolve this?

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