My company parallel expand server is got problem last 1 week, and i had to reinstall from the scratch, installation is complete without any error, and also the CDNS server. But when i add in back the Cmail server, after the synchronize is complete, we found out the dns record is taking too long of hour to propagate. Some of the customer not able to send e-mail and receive. Do we have to reinstall the DNS Controller or need to adjust any thing in DNS server. Thank you.