If I may jump in-from the external aspect...for the your domain 'cntit.com' the MX record value 'webmail.cntit.com' points to a CNAME. It must point to a host name with an A record.
Webmail.cntit.com is a CNAME pointing to webmail.cntit.com (change that entry to an A record/IP address)
do a
dig mx cntit.com
it should return an answer in the authority section...
Quote:
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This is a hosted dedicated server no LAN/WAN schema.
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Hosted whith what company & how are you currently managing DNS entries?