go
spamfilter1.webair.com has one IP number , but the reverse is mail9.webair.com. currykennyaviationgroup.com.au use this as a mailserver. webair.com is a domain controlled by two nameservers at webair.net. They are on different IP networks. Incoming mail for webair.com is handled by one mailserver at webair.com themselves. webair.com has one IP number. spamfilter1.webair.com is hosted on a server in United States.

spamfilter1.webair.com
a records
 
+ 216.130.184.24 216.130.176.0/20 AS27257 mail9.webair.com
+ --- mail9.webair.com

webair.com
a records
 
+ 209.200.29.36 209.200.16.0/20 AS27257  
+ ---  
ns-soa records
ns.webair.net
+ 67.55.118.1 67.55.96.0/19 AS27257 -
+ --- -
ns records
ns.webair.net
+ 67.55.118.1 67.55.96.0/19 AS27257 -
+ --- -
ns2.webair.net
+ 174.137.152.1 174.137.152.0/24 AS27257 -
mx records
barracuda.webair.com
+ 209.200.29.68 209.200.16.0/20 AS27257 -
+ --- -
ip numbers of host
216.130.184.24
ptrs of ip numbers
mail9.webair.com
domains using this as mailserver
currykennyaviationgroup.com.au