So grateful, but wish the multisite config was better documented

Where is the discussion on the multisite setup? Just setting this up in a MU as well.

It’s here:

https://www.ads-software.com/support/topic/plugin-wp-mail-smtp-useless-for-multisite-network-admins?replies=6

And the short answer is that in the main plugin file there is list of constants (commented out) that you can set in wp-config.php. If the constants are set, then admin pages will not be available for individual sites. It was a great help to me.