DNS is now in the sidebar for every team. Add a domain, import its records and move its nameservers to Magpie, or keep your current DNS provider. Add, edit and remove A, AAAA, CNAME, MX, TXT, CAA, SRV and NS records, check what each nameserver answers, download the zone file, and see every change in the domain's history.
DNS and Mail share each domain, so a domain already in Mail is already in DNS. Viewing a team's domains needs access to the team; changing them needs a team admin.