To add the second sending account, do I just go into microsoft admin and create a new user? For example, for my first sending account my email is bryson@xyz.com Then I would add a new user and make the email brysoncox@xyz.com ?

Going through the Warm Up domains module in the course content and was wondering how we enable the custom tracking domains for outlook? Do we do this on Porkbun or in our microsoft admin account?