I am running up a virtual host and plan on running several VMs on it. I am most familiar with the Debian flavors of Linux but am interested in what others are running. I already have a Windows server 2019 OS running Hyper-V, active directory & IIS. I have other physical servers running Apache, IPFIRE and Zone Minder, but want to trying me hand at setting up a stable and secure mail server under Linux. what re the best Linux distros to accomplish this. I will try several of the suggestions and report back. Thanks in advance for your opinions. I know how hard it is to share your opinions on such things.