I'd recommend having 2-3 separate domains apart from your primary domain for cold outreach purpose (preferably same name with different extensions - io/net/info) - so it doesn't affect the health of your primary domain. You don't want your actual emails going to spam (e.g. founders/presales team mails going to potential customers' spam - speaking from experience).
While you're using 1 of these 'outreach' domain, you can park the 2 for 'warm-up' mode. Keep an eye on the domain being used and its health. So, you can 'park' it for warm up timely and take the healthy one for use.
Pro tip: If your HR is also using your primary domain for bulk outreach to candidates, time to gift them additional for this.