I’ve read that it is best to use a subdomain (a domain different than your main one) for cold outreach as you don’t want to harm the email / domain health of the main email you use to communicate with leads in the case that your emails get marked as spam or bounce. A concrete example: using --@----.com for outreach while --@----.com for active deals.

How have people managed setting up a sub domain on G suite? In particular, do people have a completely seperate email and managed inbox for outreach, or do they use an alias (which simply forwards the emails to the main inbox).