Create reverse DNS

My ISP have updated the reverse DNS although I'm still having issues with it. When emails are sent to my email address on the mail server, sometimes I do not receive them from large websites i.e. Yahoo.com emails. I've checked with IP blacklist checkers but the IP is not on the list. I do have a PTR record on the Reverse Lookup Zones of DNS Manager on Windows Server.

After running the below Reverse DNS tool with my static IP address this shows the reverse DNS is setup properly.
http://mxtoolbox.com/SuperTool.aspx?...9&run=toolpage#

After running the below Reverse DNS tool for my mail server program MailEnable. This shows the reverse DNS is not setup. Please enter my IP 217.37.202.249 on the tool.
http://www.mailenable.com/Tools/meptrlookup.asp