How-To

The complete beginner guide to buying domains for cold email

domain_101 · 2026-03-12T00:00:00Z

Where to buy domains, naming conventions, TLD selection, how many per inbox. Everything a beginner needs to know about domain purchasing for cold outreach

domain_101 · 2026-03-12 · 2,670 views

If you're new to cold email, domain purchasing is one of those things that seems simple but has a lot of nuance. Here's everything you need to know.

Where to buy. Namecheap, Cloudflare Registrar, and Porkbun are the three best options. Namecheap is the most popular with cold emailers because of the clean interface and free WHOIS privacy. Cloudflare sells domains at cost with zero markup. Porkbun has competitive pricing and a surprisingly good UI. All three work perfectly fine. Pick whichever you prefer.

Naming conventions. Your cold email domains should look similar to your main brand but not be identical. If your company is acmesales.com, good sending domains would be acme-sales.com, getacmesales.com, tryacmesales.com, acmesales.io. Bad sending domains: totally unrelated names like randomword123.com. The prospect should be able to connect the sending domain to your real company if they Google it.

TLD selection. Go with .com first. It's the most trusted. After .com, use .io and .co as secondary options. Avoid .xyz, .info, .biz, and other cheap TLDs. They carry a spam reputation and email providers treat them with more suspicion.

How many domains and inboxes. Run 3 inboxes per domain maximum. This keeps your per-domain sending volume conservative. If one inbox on a domain gets flagged, the other two are less likely to be affected if volume per domain stays low.

Age your domains. Register domains at least 30 days before you start sending cold email from them. Brand new domains with zero history that immediately start sending outbound look suspicious to email providers. Let them sit with DNS configured for a few weeks before you begin warmup.

Cost. Expect about $9 to $13 per year per .com domain. For a 15 inbox setup (5 domains, 3 inboxes each), that's roughly $50 to $65 per year in domain costs. If you use PuzzleInbox, they handle domain sourcing for you, which saves time but you should still understand how it works.