How to buy domains for cold email (names, TLDs, forwarding)
Updated 17 October 2026 · 6 min read
Short answer
Buy secondary domains that clearly resemble your brand, such as getacme.com, tryacme.com or acmehq.com, and send cold email only from those, never from your main domain. Choose .com where possible and avoid very cheap TLDs that are heavily used for spam. Forward each domain to your main website, and buy enough for 2–3 mailboxes per domain plus a few spares.
Never send cold email from your main domain
Your main domain carries your invoices, support replies, password resets and conversations with customers. Cold outreach carries a higher risk of spam complaints than normal business mail. If a cold campaign damages domain reputation, you want that to happen on a replaceable secondary domain, not on the domain your business depends on. Microsoft's own SPF guidance recommends keeping bulk email services off your main email domain (it suggests a subdomain) for the same reason. See how to protect your main domain.
How to name cold email domains
| Pattern | Example (brand: Acme) | Notes |
|---|---|---|
| Prefix: get / try / use / go / meet | getacme.com, tryacme.com | Most common and easy to read |
| Suffix: hq / team / mail / app / labs | acmehq.com, acmeteam.com | Sounds like a real company domain |
| Short descriptor | acmesoftware.com, acmerecruiting.com | Good when brand + category is natural |
| Regional | acmeindia.com, acmeuk.com | Only if you actually operate there |
- Keep the brand recognisable so replies and look-ups make sense to prospects.
- Avoid hyphens, numbers and misspellings (acme-mail1.com, acmme.com). They look like phishing.
- Never imitate another company's brand. Only use lookalikes of your own name.
- Check the domain's history before buying: search it on blocklist checkers and the Wayback Machine to avoid inheriting a bad past.
Which TLD to choose
| TLD | Recommendation |
|---|---|
| .com | Best choice. Familiar to recipients and filters, and the default for businesses worldwide. |
| Your country code (.co.uk, .in, .de) | Fine if you sell mainly in that country and your main site uses it. |
| .co, .io, .ai | Acceptable if your brand already uses them; more expensive, no deliverability advantage. |
| Very cheap new TLDs (e.g. .top, .xyz, .click) | Avoid. Low prices attract abuse, and some appear repeatedly in Spamhaus domain abuse reports. |
A .com usually costs a little more than a promotional TLD, but the difference is a few dollars a year per domain, which is small next to the cost of a domain that filters treat with suspicion.
How many domains to buy
Divide the number of mailboxes you need by 2–3. Mailboxes are your daily emails divided by about 30. For 300 emails a day: 10 mailboxes on 4–5 domains. Add 10–20% spare domains to rotate in later. Full table: how many mailboxes per domain.
Step by step
- 1
List name candidates
Write 10–20 variations of your brand using the patterns above.
- 2
Check availability
Use the domain checker to see which are available as .com.
- 3
Check history
Look each candidate up on a blocklist checker and in the Wayback Machine. Skip anything previously used for spam or adult content.
- 4
Register with privacy and auto-renew on
Turn on WHOIS privacy and auto-renew so a lapsed domain does not break warmed mailboxes.
- 5
Set up DNS
Add MX, SPF, DKIM and DMARC records. See SPF, DKIM and DMARC for cold email.
- 6
Forward to your main site
Redirect the domain and www (301) to your real website so anyone who visits sees your company.
Why domain forwarding matters
Prospects often type the domain from your email address into a browser before replying. An empty page or a registrar's parking page looks like a throwaway domain. A redirect to your real website makes the connection clear and costs nothing.
Buying domains with ReplyDak
ReplyDak can buy domains for you (registered through Namecheap) at $13 / ₹1,099 a year each, or use domains you already own. It then sets up DNS on Cloudflare, forwards each domain to your main site, creates the mailboxes and starts warmup. Mailboxes start at $2.69 each; see pricing.
Pick your domains, and ReplyDak registers them, configures DNS and forwarding, and creates warming mailboxes automatically.
Domains, DNS, Google Workspace mailboxes and warmup. From $2.69 per mailbox ($35 for 10).
FAQ
Can I use my main domain for cold email?
It is not recommended. If cold outreach harms the domain's reputation, normal business email such as invoices and customer replies can start going to spam. Use separate lookalike domains.
What is the best TLD for cold email?
.com. It is familiar to recipients and filters. Your own country code TLD is also fine if you mainly sell in that country. Avoid very cheap TLDs associated with spam.
Should I use a subdomain instead of a new domain?
For cold outreach, separate domains are the safer choice. Subdomains are still linked to your main domain, so problems can reflect back on it.
How many domains do I need?
Mailboxes needed (daily emails ÷ 30) divided by 2–3, plus a few spares. For 300 emails a day that is 4–5 domains.
Do new domains need to age before sending?
New domains need warmup before cold sending: plan on about three weeks of gradual volume. Buying in advance and warming early gives you spare capacity.