No there is no reason you can't run 2 tcpservers on different ports I run four with differnet combos of RBL and Antivirus scanning. Mark Qmail wrote: > Is there any reason not to run two with seperate IPs on the same server. I'm > running > > This way we could easly allow domainholders to choose whether they want > their mail filtered using the various DNS based blacklists or not, > simply by pointing their mail to one of two IPs. > > Everything else would be the same on the machine. > > Am I missing something?