21 June 2026 · 2 min read
Yes. DMARC Engine is built for managing many domains and their subdomains from one account, whether you have a single brand or a portfolio of dozens. Every domain you add gets its own protection profile: its DMARC policy, SPF record, DKIM keys, MTA-STS policy and BIMI logo are tracked and managed separately, so a change to one domain never silently affects another. You add a domain in the dashboard at app.dmarcengine.com, verify ownership with a DNS TXT record, and from there each domain has its own dashboard view, its own report inbox and its own progression from p=none towards p=reject. If you are not sure where a given domain currently stands, you can run a free DMARC checker on it first, no account needed.
For larger portfolios, domains can be organised into groups so you are not scrolling through a flat list. Group domains however suits you: by client (useful for agencies and MSPs), by business unit, by sending platform or by environment. Each domain shows its current policy, alignment health and whether new reports have arrived, so you can scan the whole estate at a glance and drill into the ones that need attention. The per-domain monitoring emails mean you do not have to log in daily; you get told when something changes, such as a new sending source appearing or alignment dropping, on a per-domain basis so alerts stay relevant to the right team.
Subdomains are handled deliberately, because this is where a lot of DMARC rollouts go wrong. DMARC has an explicit subdomain policy tag, sp=, which controls what happens to mail from subdomains independently of the top-level domain's p= policy. This matters because subdomains inherit your organisational DMARC record unless they publish their own, so a strict p=reject on the parent can quietly block mail from a forgotten subdomain (or, conversely, an attacker can abuse an unprotected subdomain). DMARC Engine lets you set sp= to match your appetite, and you can also add an individual subdomain as its own managed domain when it has genuinely different senders, for example a marketing platform on news.example.com or a ticketing system on support.example.com. A common, safe pattern is:
- Keep the parent domain progressing on its own schedule from monitoring to enforcement.
- Set
sp=rejectearly on parent domains that never legitimately send from subdomains, to shut down a frequent spoofing route. - Add high-volume or third-party subdomains as separate managed entries so their SPF, DKIM and reports are tracked in isolation.
Because the platform is hosted, scaling to many domains does not mean managing many raw DNS records by hand. You delegate the relevant records once per domain (we provide the exact CNAME or NS targets), and after that we publish and update policies on the hosted side, so tightening a policy across your estate is a dashboard action rather than a DNS ticket each time. The free diagnostic tools, including the SPF checker, DKIM checker and MTA-STS checker, work on any domain whether or not it is in your account, which is handy when auditing a new portfolio before onboarding it. For more on rollout sequencing across multiple domains, see the requirements guide and our products overview.