Subdomain Strategy is an alternative to buying many cheap domains — buy a handful of premium apex domains (.io, .sh, .vc, .to) and provision up to 5 subdomains under each, with 5 mailboxes per subdomain. That's 25 mailboxes per apex. Fewer moving parts, harder to blacklist entire clusters, and premium TLDs have better default reputation. Available in the Purchase Domain wizard as a "New" option alongside Classic.
When to pick Subdomain Strategy
Subdomain Strategy is a safe alternative when:
- You want fewer domains to manage overall
- You prefer premium TLDs (.io, .sh, .vc, .to) for their default reputation
- 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.
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?
.io, .sh, .vc, and .to. These are the premium TLDs with good deliverability track records that also allow subdomains without registrar friction.
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.