.com is the safest choice for cold email — best default reputation with every spam filter — and .co, .net, and .org are close behind. Those four are the TLDs Winnr registers in the classic Purchase flow. Premium extensions (.io, .sh, .vc, .to) are available through the Subdomain Strategy. Cheap, bulk-registered TLDs like .xyz, .top, and .info aren't registrable through Winnr at all — filters treat them with suspicion by default, so we don't offer them.
Classic Purchase flow (the four Winnr registers)
.com — the gold standard. Every filter treats .com as neutral or better. One-time cost, roughly $10-$14. Use for anything.
.co — the fast alternative. Growing use commercially. One-time cost, varies widely. Good default reputation. Use as a .com backup or when the .com is taken.
.net — old but stable. Sometimes reads as "tech company" to recipients. One-time cost, around $10-$15. Solid for cold email.
.org — historically nonprofits, but widely accepted. One-time cost, around $10-$15. Slightly unusual for commercial outreach.
All four are a one-time purchase — no renewal fee, no auto-renewal.
Premium TLDs (Subdomain Strategy only)
.io, .sh, .vc, .to — good reputation, tech-leaning audience. These aren't sold as bare apexes in the classic flow; they're the premium extensions used in the Subdomain Strategy, where you buy one premium apex and put subdomains under it. Higher one-time cost per apex.
Not registrable through Winnr
.ai, .app, .dev, .xyz, .top, .info, .club, .site, .online, .live, .space — Winnr doesn't register these. The cheap ones are mass-registered by spammers, so filters treat them as suspicious by default — even a warmed, well-authenticated domain on one of these underperforms a fresh .com. The pricier ones (.ai) simply aren't part of the supported set.
Country codes for regions you don't operate in — .ru, .cn, .ir, .kp — universal red flags, and not registrable through Winnr anyway. Even if you're a US company, don't use these.
The pattern behind the rankings
Spam filters use TLD as a heuristic because domains are churned by spammers on TLDs that are cheap or unrestricted. So:
- Cheap TLDs = spammer-heavy = filter-suspicious.
- Legacy TLDs (.com, .net, .org) = mixed use, no strong signal, filters rely on other data.
- Restricted-registration TLDs (.dev requires HTTPS, .bank requires banking license) = spammer-scarce = filter-neutral.
The right move: stick with .com (or .co/.net/.org). It's why Winnr only registers the legacy TLDs plus a small set of well-behaved premium ones — a few dollars more per domain pays itself back in inbox rate.
What's next
- Buy a domain
- Subdomain Strategy — buy fewer premium TLDs instead
- Aged vs new domains — does age matter?
Frequently asked questions
Does the TLD really matter for deliverability?
Yes but it's a secondary factor. TLD reputation is roughly 5-10% of a domain's overall spam score. Authentication (SPF, DKIM, DMARC), sender reputation, and sending patterns matter more. That said, an all-else-equal .xyz domain will get filtered more aggressively than an all-else-equal .com.
Can I register .app, .dev, or .ai through Winnr?
No — those aren't registrable through Winnr. The classic Purchase flow registers .com, .co, .net, and .org; premium .io/.sh/.vc/.to are available through the Subdomain Strategy. Everything else (.ai, .app, .dev, .xyz, and so on) isn't offered.
Country TLDs (.co, .io, .to, .sh) — are those risky?
The ones Winnr offers (.co in the classic flow; .io, .sh, .to via the Subdomain Strategy) are widely used commercially and have good reputation. Country TLDs from specific regions (e.g. .ru, .cn) have poor reputation and should be avoided for cold email regardless of your actual business location — and aren't registrable through Winnr anyway.
Should I pay extra for a premium .com?
Not for cold email. Premium .coms with 3-letter names cost $500-$5000 and offer no deliverability advantage over a $10 .com. Spend that money on more $10 domains instead.