email not delivered to same domain
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12 September 2017
i have a client who hosting their email and are unable to receive email from same domain. email@example.com are not receiving email from firstname.lastname@example.org or vise versa . but they can send email fine to outside domain. the email are sent successfully and no error are returned. just like its getting lost somewhere. what can be causing this?
I didn't find the right solution from the Internet.