I need to transfer an existing domain uv cure adhesive that's currently with SiteGround to Porkbun. I also need to move the existing custom email addresses from SiteGround to Zoho Mail. I'm not sure if I should transfer the domain first and then tackle migrating the email hosting to Zoho Mail or vice-versa. It's important that there's as little downtime as possible with the emails. What's the best plan of action for this?