Infrastructure
The biggest mistake in cold outbound is sending from your main domain. One bad week of sends, one spam complaint spike, and your hello@yourcompany.com lands in the junk folder for the next six months. We’ve seen it happen.
We don’t let that happen.
Domains
Section titled “Domains”We buy lookalike domains for you. These are close variations of your real domain:
| Your domain | Example lookalike |
|---|---|
acmecorp.com | getacmecorp.com |
acmecorp.com | acmecorpteam.com |
acmecorp.com | triacmecorp.com |
We buy 3–5 of these. They’re cheap (~$12/year each) and completely separate from your production infrastructure. If one domain gets flagged or blacklisted, we rotate off it and the others stay clean.
Your main domain is never touched.
Mailboxes
Section titled “Mailboxes”We provision 10 Google Workspace mailboxes across the lookalike domains, typically 2–3 mailboxes per domain.
Each mailbox sends a maximum of 30–40 emails per day. This keeps each individual inbox within safe limits while the combined volume across 10 inboxes reaches 300–400 sends per day (~5,000/month).
Mailbox naming
Section titled “Mailbox naming”We use natural-sounding names to maximize deliverability:
james.harris@getacmecorp.comsarah.chen@triacmecorp.comm.johnson@acmecorpteam.comNot:
outreach1@getacmecorp.cominfo@triacmecorp.comDNS configuration
Section titled “DNS configuration”Every domain gets full authentication configured before a single email is sent:
SPF — Declares which mail servers are authorized to send on behalf of the domain. Without this, receiving servers have no reason to trust your emails.
DKIM — A cryptographic signature attached to every email. Proves the message wasn’t altered in transit and that the sender controls the domain.
DMARC — A policy that tells receiving servers what to do when SPF or DKIM fails. Starts at p=none for monitoring, then hardens to p=quarantine after warmup.
We verify all three are correct using MxToolbox before the first send. This takes 2–3 days after domain purchase due to DNS propagation.
Warming
Section titled “Warming”New mailboxes need to build a positive sender reputation before cold outreach begins. Without warming, your emails land in spam from day one.
We warm all 10 mailboxes simultaneously using an automated warmup network (real inbox-to-inbox exchanges that generate opens, replies, and moved-from-spam signals).
Warmup timeline
Section titled “Warmup timeline”| Period | Daily sends per mailbox | Warmup activity |
|---|---|---|
| Days 1–7 | 0 cold emails | Warmup network only (~20 exchanges/day) |
| Days 8–14 | 5–10 | Light cold volume starts |
| Days 15–21 | 15–25 | Ramping up |
| Days 22–30 | 30–40 | Full capacity |
The warmup network runs continuously in the background even after warmup completes, maintaining reputation between campaigns.
What happens if a domain gets blacklisted
Section titled “What happens if a domain gets blacklisted”It’s rare with our setup, but it happens. Our response:
- Immediately pause sending from that domain
- Identify the cause (usually a spam complaint spike from bad list quality)
- Rotate active sequences to clean domains within 24 hours
- Decide whether to delist the domain or retire it and buy a new one
We monitor blacklist status daily using automated checks against the major RBLs (Spamhaus, Barracuda, etc.).
Ownership
Section titled “Ownership”All domains and mailboxes belong to you. If you leave BuyerBrains:
- Domains are transferred to your registrar account
- Google Workspace seats are transferred to your billing
- We hand over all credentials
Nothing is locked to our platform.
Want us to run this for you?
BuyerBrains handles the full system end-to-end — signals, copy, sends, and booking. Book a 15-min intro to see if we're a fit.