Subdomain Strategy is an alternative to buying many cheap domains — run up to 5 subdomains under one apex domain, with 5 mailboxes per subdomain. That's 25 mailboxes per apex. Fewer moving parts, harder to blacklist entire clusters. Three ways to use it: buy a premium apex (.io, .sh, .vc, .to) in the Purchase Domain wizard, connect a domain you host elsewhere with the subdomain format option in the Connect Domain flow, or convert a domain you already bought through Winnr for free under Settings → Tools → Subdomain Strategy (any TLD, no new registration).
Three ways to start
The strategy isn't tied to buying a new domain — it works with domains from any of Winnr's three entry points:
- Buy through Winnr. Choose "Subdomain Strategy" in the Purchase Domains wizard. You pick a premium apex (.io, .sh, .vc, .to) and up to 5 subdomain names; Winnr registers the domain and provisions everything.
- Connect a domain you host elsewhere. In the Connect Domain flow, tick the subdomain format option and choose your subdomain names. Your apex DNS stays completely untouched — Winnr adds records only at the subdomain level (via manual records or a Cloudflare API token), so this is the safe way to use a live business domain.
- Convert a domain you already own through Winnr. The transfer tool under Settings → Tools → Subdomain Strategy converts any domain you purchased through Winnr into a Subdomain Strategy domain — free, any TLD, no new registration, existing mailboxes untouched.
When to pick Subdomain Strategy
Subdomain Strategy is a safe alternative when:
- You want fewer domains to manage overall
- You like the option of premium TLDs (.io, .sh, .vc, .to) for their default reputation — though the strategy works on any TLD, .com included
- You're okay with a slightly higher cluster-risk (a blacklist on one apex affects all its subdomains)
Classic domains — buying many .com/.co/.net apexes — is what most customers still pick. It has the lowest cluster risk (each apex is independent) and the cheapest per-apex cost. Both routes are fully supported.
What it looks like in your account
Each premium apex domain appears in your Domains list with its subdomains nested underneath — 5 mailboxes per subdomain, up to 5 subdomains per apex. Filter the Domains list by "Subdomain strategy" to see just these clusters.
How the math works
Classic setup for 100 mailboxes: - 20 .com domains × 5 mailboxes each = 100 mailboxes - Cost: ~$200 one-time in domain registrations (no renewals) - 20 apexes to monitor, 20 sets of DNS records to manage
Subdomain Strategy for 100 mailboxes: - 4 premium apex domains × 5 subdomains × 5 mailboxes = 100 mailboxes - Cost: ~$250 one-time in domain registrations (premium TLDs cost more; still no renewals) - 4 apexes to monitor, 4 sets of parent DNS records to manage, plus each subdomain gets its own DKIM
What subdomain names to pick
The subdomain names Winnr provisions should sound neutral. Safe patterns:
marketing.yourcompany.ioteam.yourcompany.iohq.yourcompany.iohello.yourcompany.ioconnect.yourcompany.iocontact.yourcompany.io
Avoid: outreach., cold., blast., bulk., mass., spam. — these read as cold-email signals, and the wizard rejects them outright.
Winnr's Subdomain Strategy wizard suggests neutral defaults and blocks these spam-signal labels automatically.
What's next
Frequently asked questions
How does this compare to buying 20 cheap .com domains?
Cost — subdomain strategy is more expensive per apex domain but you buy fewer of them, so total cost is usually within 20% of a classic .com setup. Deliverability — premium TLDs (.io, .sh) start with slightly better reputation. Risk — if one apex domain gets blacklisted, all its subdomains are affected, so cluster risk is higher. Classic remains "Recommended" for most use cases; subdomain strategy is the alternative safe route.
Which TLDs are available?
The strategy itself works on any TLD, .com included. The Purchase Domain wizard pairs it with .io, .sh, .vc, and .to — premium TLDs with good deliverability track records — but that list only applies to buying a new strategy domain. The converter (Settings → Tools) and the connect flow's subdomain format accept any TLD, so if you want the strategy on a .com, buy the .com via Classic and convert it for free, or connect one you already own.
Can I use subdomains for cold email?
Yes — subdomains for cold outreach work fine. Recipients rarely notice the subdomain vs apex. The key is that the subdomain names should read as neutral (marketing.company.io, team.company.io, hello.company.io) rather than obviously bulk. The wizard blocks the obvious cold-email labels — outreach, cold, blast, bulk, mass, spam — so you'll be steered toward neutral names automatically.
How many mailboxes per subdomain?
Up to 5, same as any Winnr domain. So a single .io apex with 5 subdomains = 25 mailboxes total on one apex.
Can I mix Classic and Subdomain Strategy?
Yes — nothing stops you. Some customers buy 3 .io apex domains for subdomain-strategy sending, plus 10 .com burner domains via Classic. Winnr treats them the same in the app.
Can I convert a domain I already own into a Subdomain Strategy domain?
Yes, if you bought it through Winnr — the converter is under Settings → Tools → Subdomain Strategy. It's free, works on any TLD (the premium-TLD list only applies to new purchases), and registers nothing new. Your existing mailboxes on the domain are untouched; you just pick subdomain names and Winnr provisions them. An aged domain with history is an excellent candidate. The same tool is also how you add more subdomains to an existing Subdomain Strategy domain later, up to the cap of 5.
Can I use the Subdomain Strategy with a domain I host elsewhere?
Yes — when connecting the domain, tick the subdomain format option in the Connect Domain flow. Winnr never touches your main domain's DNS (no MX or SPF on the apex), so it's safe even for a live business domain — mail runs entirely on the subdomains. This path works with manual DNS records (grouped per subdomain, with a CSV) or a Cloudflare API token; pointing the whole domain's nameservers at Winnr isn't offered in subdomain format, since the point is leaving your zone alone.