Should You Use Your Main Domain for Cold Email? (No — Here's the Math)
Why cold email belongs on secondary domains: shared reputation, asymmetric downside, and the standard lookalike-domain architecture.
Blog
Data-driven research on cold email domain strategy, infrastructure scaling, and multi-domain management.
How Many Mailboxes Per Domain for Cold Email? The 2–3 Rule
Why 2–3 mailboxes per domain is the stable equilibrium — capacity math, risk concentration, and the scaling table by daily volume.
How Much Does Cold Email Infrastructure Cost? Budget Math by Volume Tier
Domains, mailboxes, verification, and the costs that don't show up on invoices — full build-up for 200, 500, and 1,000 sends per day.
How Many Domains for Cold Email: Data-Backed Infrastructure Guide (2026)
Complete analysis of optimal domain counts by sending volume, with cost breakdowns and deliverability benchmarks.
Cold Email Domain Rotation Strategy: When and How to Rotate Sending Domains
Active, resting, and warm-up domain tiers — the rotation framework that prevents blacklisting at scale.
How to Choose Domain Names for Cold Email: TLD, Naming, and Registrar Guide
Which TLDs work best, naming conventions that build trust, and registrar pricing comparison for bulk purchases.