Hi. I am certain the issue we are experiencing is one that is very common. We have an internal spam filter [10.1.1.5] that receives all smtp traffic by being translated to 22.214.171.124 [obviously an example IP] on the Internet. Therefore, our public mail.acme.com is 126.96.36.199. Now, our mail server [10.1.1.10] send OUT mail on 188.8.131.52 [public]. The PROBLEM is that today, many firms are using reverse lookups when they receive an email. Thus, an email received from us has a source address 184.108.40.206 yet our 'SPF' record returns 220.127.116.11 for the lookup. The mail is droppeed. We need to have all smtp outbound mail 'look like' its source address is 18.104.22.168 EVEN THOUGH incoming traffic for 22.214.171.124 goes to the spam filter at 10.1.1.1. I hope that makes sense.... I've tried reversing the parameters in static translations to now avail... Please help.