I've been struggling to achieve a standard setup where SM and the DNS provide all the correct responses to all devices across different OS (Windows, Mac, Linux, iOS, Android) and different apps (MS Outlook, eM client, Windows Mail, K9 Mail, Outlook for Android/iOS, Apple Mail, Android/Samsung Mail).

Is anyone able to share their ideas or what's currently working well for your install?

Yes, I've followed the KB article on SM site, but its just not achieving it well across the range of devices and apps - im sure there's more to it than written there. For example there's a web.config redirect or autodiscover.xml on that KB article but no .htaccess - so the article seems incomplete to deal with multiple platforms of webhosting to serve .htaccess also.

Thanks in advance for your recommendations!