hi guys, I have struggled with this for hours and am no closer to a resolution in my mind. when setting up a shared Webhosting server that also provides email, I am struggling to know whether one should have domains on the server using: A. incoming and outgoing mail server as mail.clientsdomain.com or B incoming and outgoing mail server as host.fqdn.com the reason I am asking about this is that the Microsoft Outlook app on mobile phones appears to be an absolutely finicky program to configure and seems to automatically want to use mail.clientsdomain.com as the incoming and outgoing mail server. when I go into thunderbird on a desktop pc, I am finding that the auto-detect is about as reliable as a water bucket with holes in it...sometimes it detects, other times one has to stuff around with options to get it to select the option that I know works (even though initially thunderbird says it doesn't). so what are the failsafe mail server settings to use for hosting client's mail? Where is the best place to find the right tutorial on configuring the best setup for email for many domains?