MX and A records are used by a DNS server to decide what to do with incoming email. You can set your MX and A records on your domain to tell it to let your exchange server handle any emails sent to the domain. This tutorial aims to provide a thorough understanding of the process of configuring your MX & A records.
NB: Because all website hosting ISP's are different, the steps for changing your MX and A records are likely to be different than shown in this tutorial. For directions on where to go on your hosting control panel in order to change your MX and A records, contact your web host.
First, some general knowledge about DNS records:
DNS records are comprised of 4 parts:
In order to set up your domain MX and A records for use with an Exchange server you need to create two new DNS records like this:
After about 5 minutes your DNS record changes should be reflected on the domain. At this point, try sending a test email. If you recieve it through your Exchange server the DNS records have been updated. At this point you should change the TTL of BOTH DNS records to a longer period, e.g. 24 hours. This will make queries to the DNS server respond faster.
And your done! for information about how to setup an exchange server go here: