Set up cold email inbox infrastructure from scratch — Google Workspace, Microsoft 365, and Azure/Entra inbox provisioning, DNS authentication, domain buying, warmup, and cost optimization. Use when setting up sending infrastructure, buying domains, provisioning mailboxes, or scaling cold email sending capacity. Triggers on: "inbox setup", "email infrastructure", "buy domains", "Google Workspace inbox", "Microsoft inbox", "Azure inbox", "cold email setup", "sending infrastructure", "provision inboxes", "DNS setup", or any request about building cold email infra.
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Set up cold email inbox infrastructure from scratch — Google Workspace, Microsoft 365, and Azure/Entra inbox provisioning, DNS authentication, domain buying, warmup, and cost optimization. Use when setting up sending infrastructure, buying domains, provisioning mailboxes, or scaling cold email sending capacity. Triggers on: "inbox setup", "email infrastructure", "buy domains", "Google Workspace inbox", "Microsoft inbox", "Azure inbox", "cold email setup", "sending infrastructure", "provision inboxes", "DNS setup", or any request about building cold email infra.
license
MIT
compatibility
Claude Code, Jesse, Codex, Hermes, Windsurf, OpenCode, Gemini CLI, Copilot, Zed, VS Code, Goose
Cold email infrastructure is the foundation underneath every outbound motion.
Get it wrong and your copy, targeting, and offer don't matter — you're in spam.
This skill covers DIY inbox provisioning across Google Workspace, Microsoft 365,
and Azure/Entra, plus DNS authentication, warmup, and infrastructure scaling.
When to Use
"Set up cold email inboxes"
"Buy domains for cold outreach"
"Provision Google Workspace mailboxes"
"Set up Microsoft 365 for cold email"
"Configure DNS for sending domains"
"Scale my sending infrastructure"
"How many inboxes do I need?"
Authoritative Foundations
Google Bulk Sender Guidelines — sender authentication, low spam complaint rates, and authenticated alignment are baseline requirements for sustainable outbound.
Domain isolation is non-negotiable: never send cold from the primary business domain; use separate sending domains with independent reputation.
Microsoft Email Sender Guidelines — maintain authenticated mail, clean lists, low complaints, and conservative volume ramps to protect sender reputation.
Eric Nowoslawski (Growth Engine X) — inbox infrastructure at scale
emails/month. Strategy: 2 inboxes per domain, 30 emails/day per inbox,
3-week warmup minimum, keep 50% spare capacity warming at all times.
Jed Mahrle (Practical Prospecting) — 30,000+ subscribers. "Cold email
isn't a numbers game anymore. It's a relevance game. Send fewer emails to
better fit accounts."
Prerequisites
Domain registrar account (Namecheap, GoDaddy, Google Domains)
Google Workspace or Microsoft 365 tenant (or Azure/Entra for Hypertide-style)
DNS management access
Budget: ~$6-15/mailbox/month for Google, $4-6/mailbox/month for Microsoft,
plus domain costs ($10-15/domain/year)
Step-by-Step Process
Phase 1: Domain Acquisition
Buy 3-5 secondary domains for cold outreach. Never use your primary business domain.
Rules:
.com or .co preferred — avoid unusual TLDs that trigger spam filters
Domain should be a variation that could be a real company (e.g., tryacme.com,
getacme.io, acmehq.com)
Redirect the domain to your main site or a simple landing page
SPF:v=spf1 include:_spf.google.com ~all (Google) or
v=spf1 include:spf.protection.outlook.com ~all (Microsoft)
DKIM: Generate in admin console (Google: Apps > Gmail > Authenticate email.
Microsoft: Security > DKIM). Add the generated TXT record to DNS.
DMARC: Start with v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com.
After monitoring for 2-4 weeks, tighten to p=quarantine, eventually p=reject.
Verification: Use MXToolbox or Google Admin Toolbox to verify all records
resolve correctly. A single misconfigured record = spam placement.
Phase 4: Warmup (2-4 Weeks Minimum)
Week 1: 5-10 emails/day to known-engaging addresses
Week 2: 15-25 emails/day, mix warm and cold
Week 3: 30-40 emails/day
Week 4: 40-50 emails/day, full cold sending
Use a dedicated warmup tool (Instantly Warmup, Smartlead Warmup, or
Hypertide's built-in warmup). Monitor inbox placement weekly.
Eric Nowoslawski note: "We used to be able to launch low volume without
waiting 3 weeks. These days, inboxes may not be ready even after a full 3
weeks." Plan conservatively.
DIY vs Done-For-You: DIY costs less per mailbox but requires 4-8 hours of
setup plus ongoing maintenance. Done-for-you (ScaledMail, Hypertide) costs
more per mailbox but ships in hours to days. The breakeven: if your time is
worth >$100/hr, done-for-you wins at any scale.
Output Format
Infrastructure plan with: domain inventory, mailbox count by provider, DNS
record sheet, warmup schedule, cost model (setup + monthly), and monitoring
dashboard setup.
Quality Check
No primary business domain used for cold sending
SPF, DKIM, DMARC configured and verified on every domain
2-3 inboxes per domain maximum (Google) or 25 (Microsoft)
30-50 sends/day/inbox maximum
2-4 week warmup completed before any cold sends
50% spare capacity warming at all times
MXToolbox or equivalent verification passed on all domains
Common Pitfalls
Sending from primary domain. One spam complaint and your password
resets, invoices, and support emails go to spam too. Never.
Too many inboxes per domain. 10+ mailboxes on one domain signals
bulk sending to spam filters. 2-3 for Google, 25 max for Microsoft.
Skipping warmup. New domains sent at full volume get blacklisted
within 48 hours. There is no shortcut.
Sending unverified emails. 5%+ bounce rate triggers automated spam
filtering. Always verify with a service like LeadMagic Email Validation
before sending.
No spare capacity. If inboxes burn out mid-campaign and you have no
spares warming, your pipeline stops. Keep 50% spare capacity.
DNS misconfiguration. A missing DKIM record or incorrect SPF syntax
is caught by every major inbox provider. Triple-check all records.
Execution Artifacts
references/framework-notes.md — Named frameworks and reference tables
templates/output-template.md — Deliverable shell for agent output
