HI guys, thanks for all your advice thus far. i just want to run something past you... im wanting to setup a hosted combined mail and dns server as well as an onsite combined dns and mail server. sync would be great but not essential as the onsite will be the failover mail server as that my users can still send and receive emails if there is ever an issue with the hosted system. any recommendations before i spend the next 7 days trial and error. i run centos 7.3 and can work my way around minor differences between that and debian.