We replaced an extremely old PIX with an ASA 5505. We duplicated the old config on the new ASA (when possible) but still having a couple issues. The biggest one is that the old PIX had a rule that assigned an additional wan ip address to the outside interface.
global (outside) 1 74.x.x.12
I don't think the ASA is using that line (if at all) the way the pix did because we are having issues with some outbound email bouncing back due to our SPF record. The SPF record is set to 74.x.x.12 but when I telnet into other mail servers, they are seeing me come from 74.x.x.10 which is the IP assigned to the outside interface 0/0 of the ASA.
Any ideas how to resolve this besides changing the SPF record?