Organizational-sensitive Gmail link

Problem statement

I'm creating an internal dashboard for my organization, and would like to link to all relevant internal resources. That includes Gmail and Google calendar.

However, just linking to http://gmail.com jumps some users into their personal E-mail inboxes. And I'd like to avoid that!

Possibly something like this:

https://mail.google.com/mail/?preferdomain=mycompany.com

Does anyone know if this is possible?

Prior research & threads

1. When logged in, users seem to get an "account id" in the URL field.

   https://mail.google.com/mail/u/0/#inbox
   https://mail.google.com/mail/u/1/#inbox
   

2. It seems to be possible to control login for specific users with the authuser query parameter

   https://play.google.com/music/listen?authuser=personaluser@gmail.com
   

3. It seems to me that Google possibly has some documentation for this, but I have yet to find it.

Thanks!