**Changing DNS Records.**
Prior to migration*, contact your DNS provider to have your DNS Records (MX, CNAME, and TXT) pointed to the hosted Exchange environment – the specific server records are listed below.
server4.inboundmx.com (preference 10)
server5.inboundmx.com (preference 20)
Create a new CNAME record for Autodiscover, and point the record to: autodiscover.h01.hostedmail.net.
Example: autodiscover.yourdomain.tld –> autodiscover.h01.hostedmail.net
v=spf1 mx include:h01.hostedmail.net include:Spf.messagelabs.com ~all
NOTE: DNS changes do not take effect immediately The amount of time before the change takes effect is determined by the TTL (Time-To-Live) value. Thus, even after submitting the change to our MX records, emails will continue directing to your old MX servers for the duration of the defined TTL. To minimize this window, we strongly advise lowering the TTL value of your existing MX records to 5 minutes (600 seconds). Many default TTLs for MX records can be as long as 24 hours (86400 seconds). Therefore, the TTL value of your existing MX records should be lowered at least 24 hours in advance of switching to our MX records, (to allow the new, lower TTL to take effect). Then, when you do perform the final switch to our MX records, the change will go into effect and all inbound deliveries will begin directing to the MegaPath servers after just 5 minutes. This allows for a much more “seamless” transition to your new Hosted Exchange service.
If your DNS host does not allow setting the TTL as low as 5 minutes, then set it as low as is allowed.
*It may take up to 48 hours for DNS propagation depending on your DNS registrar and the TTL values.