I have one client who uses a dynamic IP from his ISP but 7 out of the 10 IPS are blacklisted on the spam sites. I use the Spam Assassin and Post-screen plugins on the server which are ovioulsy blocking him sending email via my server. If he reboots his router he might get a clean IP address but most times they are all blacklisted. (Crappy ISP)
Is there any way to exclude his domain from these checks so it does not check his Internet's IP before trying to send?