The "Burner Domain" Strategy: How to Send 500+ Emails a Day Without Landing in Spam

Here is the nightmare scenario for any B2B Founder:

You decide to try cold email. You scrape a list of 1,000 leads. You load them into a tool, connect your main work email (name@yourcompany.com), and hit send.

Three days later, you notice something strange. Your existing clients aren't replying to you. Your invoices aren't getting paid. You send a test email to your personal Gmail, and it goes straight to the Spam folder.

You just burned your primary domain.

Google and Microsoft have declared war on spam. If they see a spike in volume from your main business address, they will blacklist you. Once you are blacklisted, getting out is nearly impossible.

But does that mean cold email is dead? No. It just means you need a Stunt Double.

What is a "Burner Domain"?

A Burner Domain (or Secondary Domain) is a domain name that looks almost identical to your main company URL but is technically separate.

If your main website is swestun.com, your burner domains might be:

• swestun.co

• tryswestun.com

• getswestun.com

We buy these domains specifically for outbound sales. We set them up, we warm them up, and we send cold emails from them.

The Strategy is simple: If a burner domain gets flagged or blacklisted, we simply delete it and buy a new one for $15. Your main company email—the one you use to talk to investors and clients—never sends a single cold email. It stays pristine.

The 3-Step "Fortress" Setup

You can't just buy a domain and start blasting. You need to authenticate it so Google trusts it. Here is the infrastructure checklist we use for every client at Swestun.

1. The DNS Triad (SPF, DKIM, DMARC)

These are three records you add to your DNS settings (GoDaddy, Namecheap, etc.) that act as a digital ID card.

• SPF (Sender Policy Framework): A list of IP addresses allowed to send email on your behalf.

• DKIM (DomainKeys Identified Mail): A digital signature that proves the email hasn't been tampered with.

• DMARC: A rule that tells receiving servers what to do if an email fails the first two checks.

Pro Tip: Always set your DMARC policy to p=quarantine or p=reject eventually. Spammers use p=none. Legitimate businesses use strict policies.

2. The Forwarding Redirect

You want your prospects to trust you. If they receive an email from luke@getswestun.com and type that domain into their browser, it needs to load a real website.

We set up a 301 Redirect on all burner domains to point back to your main website.

• Prospect sees swestun.co.

• Prospect clicks link.

• Browser redirects to swestun.com.

• Result: Seamless trust.

3. The 14-Day Warmup

This is where most agencies fail. A brand new domain has "Zero Reputation." If a new domain suddenly sends 100 emails in one day, Google blocks it immediately.

You must use an automated Warmup Tool (like the one inside Instantly.ai). This tool creates a network of real inboxes that email each other, open your emails, mark them as "Not Spam," and reply to them.

The Schedule:

• Day 1-3: Send 5 emails/day.

• Day 4-7: Ramp to 15 emails/day.

• Day 8-14: Ramp to 30 emails/day.

• Day 15: You are ready to launch.

The Math of Volume

At Swestun, we follow a strict rule: Never send more than 50 emails per day per inbox.

If you want to send 500 emails a day, you don't increase the volume on one email account. You buy 10 email accounts.

• 10 Domains x 1 Inbox each = 10 Inboxes.

• 10 Inboxes x 50 Emails = 500 Emails/Day.

This "Horizontal Scaling" creates a decentralized network that is impossible to kill. If one domain has an issue, the other 9 keep printing money.

Final Thoughts

Cold email is not about writing a clever subject line. It is about Engineering.

If you get the infrastructure right, you can be boring and still get leads because you are landing in the Primary Inbox. If you get the infrastructure wrong, you can have the best offer in the world, and no one will ever see it.

Don't want to mess with DNS records? At Swestun, we build this entire infrastructure for you. We buy the domains, handle the authentication, and manage the warmup. Book your Infrastructure Audit here