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From cpanel webmail, I can send to gmail, but cannot sent to or any other o365 domain.

Can anyone help me, I have a problem as below :

- I can receive an email in webmail, from any domains.

- and so far I only can send an email out to, or, BUT

- when I send an email to or any other domain that hosting in office365, they cannot receive my email. 

Please help !!, Thank you