The following are the Public Facing IP addresses that Blackbaud uses to send mail:

63.108.88.174
66.45.42.178
66.45.42.179
66.45.42.181
206.79.6.0/24
206.79.6.130
206.79.6.131
206.79.6.135
206.79.6.136
206.79.6.137
206.79.6.150
206.79.6.151
206.79.6.155
206.79.6.156
206.79.6.157
206.79.6.170
206.79.6.171
206.79.6.172
206.79.6.175
206.79.6.176
206.79.6.177
 
 
Server names:
 
dc01sm01v0.kintera.com
dc01sm03v5.kintera.com
dc01sm04v7.kintera.com


It is also possible to whitelist the following domains:
mailer1.kintera.com
mailer2.kintera.com
mailer3.kintera.com
mailer4.kintera.com