Hello,I would like to request some assistance regarding a problem I am facing right now.I have to modify a existing configuration to suite new needs,as follows:1 zimbra server (centos) also doing firewall NAT and dhcp for internal network,bind configured on it,1 isp,1 public ip,everything works ok.The problem I'm facing now is that I needed to add a second isp for failover reasons,done by placing a 2 wan router in front of the server,so far results are working internet for internal network,but problems with the mail server,because of the changing in public ip's,followed split dns tutorial,and now mail.mydomain.com is no longer accesible,while mx.mydomain.com is accessible only for internal network.Please help,total noob here