Ok I have been getting denied respones from other mail servers because they can not reslove my mail servers IP. I set up a ptr with my ISP, but my pix box will not let the request go though to the internal mail server. I have set up access-list outsode_in permit icmp any any but only the outside interface on the unit will respond. I have found a link saying I can use a permit icmp any host xxx.xxx.xxx.xxx and that will forward the icmp request but it doesn't seem to work. Any thoughts?