I installed 5 hp dl360 G5 servers with debian 6 and ispconfig 188.8.131.52 in a multiserver setup where a master and 4 mirrors all share all services and have master to master DB replication. I have two Zen Load Balancers setup to listen on two static IP's from my Comcast Business Class service. One listens for ns1 and the other listens for ns2. The 5 servers are behind the LB's on local ips 192.168.0.200-204. The LB's are porting all ports to the 5 servers and all web services and db services seem to be working fine. Web pages are getting served up and wordpress sites are finding and using db's just fine. When it comes to email, however, the services are somewhat skewed. The squirrelmail service can be accessed by going to the LB's ip address, but cannot authenticate on any un or pw. Squirrelmail can authenticate and send and recieve when going to it from one of the servers local IP's 192.*.*.200-204. Email Client can authenticate to receive from inside the network but not send. The client cannot authenticate from outside the network to send or recieve. I am at a loss as to what to do. Please help me in any way you can. I am attaching the mail.log from server 1. I will be happy to provide the logs from the other servers if necessary. Thanks for all your help.