Domain Burn Alerts: free detection for SmartLead and Instantly. Domain Burn Alerts: free for SmartLead & Instantly
Check your domainsThe domain generator built for cold email rotation — not for naming a startup.
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Every variation is checked against the live registry and scored for cold-email sending, so you know what is free and what is safe before you spend anything.
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Choosing the right domain variations for cold email can make or break your deliverability. You need domains that look trustworthy and avoid red flags. A good lookalike domain generator gets you close to your brand without tipping into the shapes filters distrust.
A word in front of your brand. The most natural shape for outreach, because the recipient still reads your company name first.
A word after your brand. Signals the same company without copying the root domain outright.
Bend the brand itself. Useful when the exact .com is gone and you do not want to add a word.
Same name, different extension. Workable at volume, but every non-.com carries slightly lower default trust with receiving filters.
Avoid these. A hyphen is one of the oldest spam signals there is, and it costs you nothing to pick a different shape.
Avoid these too. Digits in a sending domain correlate strongly with spam and give you nothing a word would not.
.com, .net, .io, or .cocontactbrand.com, getbrand.io, joinbrand.netMaintaining deliverability and testing it requires you to have multiple cold email domains in rotation. Start with at least 10. Just enough to spread volume and isolate issues.
Each domain should handle no more than ~75 emails/day to stay under the radar. Cold emailing requires volume to test messaging; you need to send at least 2,000 emails to validate a campaign*.*
For example, 50 domains give you 3,750 sends/day without risking reputation.
Run that list through a domain variation checker before you buy: a bulk domain checker tells you which of the names are already gone in one pass.
Generate your domain variations now → Free, no signup — availability checked live.
Based on 3 inboxes per domain and 25 emails per inbox per day — the ceiling that keeps a domain under the radar.
Generate that many variations ↑It protects your main domain. Rotating domains will increase your chances of landing in the inbox and lessen your chances of getting blacklisted.
A domain name generator invents a brand from nothing, which is what you want when you are naming a company. A domain variation generator starts from the brand you already have and produces sending domains that still read as you. For cold email you want the second one, because recipients need to recognise the sender.
Because recognition is what makes a cold email look legitimate rather than anonymous. A recipient who sees a domain close to your real one treats the message as a company contacting them. An unrelated invented name reads like a stranger, and it gives you nothing to point at when someone checks who you are.
Prefixes such as getbrand.com and suffixes such as brandhq.com perform best, because they keep your brand at the front of the name and use no characters that filters distrust. Plurals and verb forms work when the exact .com is gone. TLD swaps are workable but carry slightly lower default trust. Avoid hyphens and digits entirely.
Work backwards from daily volume. Each domain should carry no more than 75 emails a day, which is 3 inboxes sending 25 each. So 750 emails a day needs 10 domains and 30 inboxes; 3,000 a day needs 40 domains and 120 inboxes. The calculator on this page does the arithmetic for any volume.
Yes, on every sending domain without exception. An unauthenticated domain will be filtered no matter how good the name is, and the three records are what let receiving servers verify you. Our guide to SPF, DKIM and DMARC walks through each record. Aerosend configures them for you automatically.
Instead of sending the same volume every day, you vary it up and down in a wave. Flat, identical daily volume looks automated to filters; natural senders have busy days and quiet ones. Varying the curve across your domain pool makes the pattern read as human.
Not every provider is designed for outbound. Pick one that is, or you inherit someone else’s sending reputation.
Caps each domain at 75 emails a day and spreads volume so no single domain carries all the risk.
3 inboxes × 25 sends = 75/dayIf one provider shifts its algorithm or bans overnight, you still have somewhere to send from tomorrow morning.
Warming a fresh variation is faster and safer than rebuilding trust in a dead one. Retire it and move on.
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