Please use the following SPF Record; based on the Hosted Exchange plan you have.

For Hosted Exchange 2010 users:

v=spf1 a mx ptr ip4:69.160.246.135 ip4:69.160.246.125 ip4:69.160.246.126 ip4:198.77.13.239 ip4:38.101.176.202

Hosted Exchange 2007

“v=spf1 a mx ptr ip4:198.77.13.241 ip4:198.77.13.239 ip4:204.145.70.14 ip4:204.145.70.15 ip4:38.101.176.207 -all”

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