The following are the current Postini outgoing IP address ranges as of November 2010 :
64.18.0.0 - 64.18.15.255 -- 64.18.0.0/20 -- 64.18.0.0 mask 255.255.240.0
74.125.148.0 - 74.125.151.255 -- 74.125.148.0/22 -- 74.125.148.0 mask 255.255.252.0
74.125.244.0 - 74.125.247.255 -- 74.125.244.0/22 -- 74.125.244.0 mask 255.255.252.0
207.126.144.0 - 207.126.159.255 -- 207.126.144.0/20 -- 207.126.144.0 mask 255.255.240.0
The range used to relay email to your server is likely only one of these ranges.
The current list can be found at the Postini support site here.
64.18.0.0 - 64.18.15.255 -- 64.18.0.0/20 -- 64.18.0.0 mask 255.255.240.0
74.125.148.0 - 74.125.151.255 -- 74.125.148.0/22 -- 74.125.148.0 mask 255.255.252.0
74.125.244.0 - 74.125.247.255 -- 74.125.244.0/22 -- 74.125.244.0 mask 255.255.252.0
207.126.144.0 - 207.126.159.255 -- 207.126.144.0/20 -- 207.126.144.0 mask 255.255.240.0
The range used to relay email to your server is likely only one of these ranges.
The current list can be found at the Postini support site here.