Add these DNS records to point to the Exchange Servers
Autodiscover CNAME Records
autodiscover points to autodiscover.h02.fusionemail.net
v=spf1 include:spf.messagelabs.com ~all
Important: The time for DNS Record changes to propagate is based on your TTL (time to live) setting. For example, if your TTL was originally set for 24 hours, you must wait the full 24 hours for the DNS Record changes to take effect.
Some DNS services don't allow prioritization using the numbers 10-60, and may use a different numbering scheme (for example, 1-6). You may use any prioritization numbers as long as the DNS entries are in the order described above.