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My Zimbra server send email ok but can not receive external email
My server Uses ZCS Open Source Edition. It has work good for a month. Ten days ago it couldn't receive email from Internet and could send email to Internet. In forum I have read ask2me007 's CANNOT RECEIVE MAIL,My server have mail loops back to myself error after installed,Not receiving email happened ten days ago.I have not do any change after installition.
cat /etc/hosts
cat /etc/resolv.conf
dig yourdomain mx
dig yourdomain any
host `hostname ` <- note backticks and not single quotes (type exactly as specified)
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My Zimbra server send email ok but can not receive external email 
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