← Cold Email Strategy Guides EXECUTIVE ENGINEERING BRIEFING Published: October 2026 • Author: Fred Dawson • Deliverability & MTA Architecture Standard Executive Summary: Step-by-step technical guide for configuring cold email domains and subdomains: DNS propagation, SPF flattening, 2048-bit DKIM, strict DMARC, and MX records. DKIM Key Length 2048-bit RSA Modern cryptographic minimum DMARC Enforcement p=reject […]
← Cold Email Strategy Guides EXECUTIVE ENGINEERING BRIEFING Published: October 2026 • Author: Fred Dawson • Deliverability & MTA Architecture Standard Executive Summary: Master the three-tier cold email domain rotation strategy: staging active, warmup, and resting domains across dedicated infrastructure to preserve deliverability. Domain Spread 5 Active / 2 Rest Recommended fleet tier Max Daily […]
← Cold Email Strategy Guides EXECUTIVE ENGINEERING BRIEFING Published: October 2026 • Author: Fred Dawson • Deliverability & MTA Architecture Standard Executive Summary: Strategic guide to multi-domain cold email: root domain protection, buying secondary domains, registrar distribution, brand variance, and forwarding hygiene. Root Domain Risk Zero Ingress Complete air-gap isolation Secondary Spread 10–25 Domains High-volume […]
← Cold Email Strategy Guides EXECUTIVE ENGINEERING BRIEFING Published: October 2026 • Author: Fred Dawson • Deliverability & MTA Architecture Standard Executive Summary: 2026 Cold Email Deliverability Benchmark Report: Data from 20M+ B2B outreach messages analyzing reply rates, bounce rates, domain rotation impact, and ESP filtering trends. Median Reply Rate 3.8% Overall Across verified B2B […]
← Cold Email Strategy Guides EXECUTIVE ENGINEERING BRIEFING Published: October 2026 • Author: Fred Dawson • Deliverability & MTA Architecture Standard Executive Summary: Enterprise guide to cold email A/B testing: sample size math, controlling deliverability variables, subject line testing, spintax entropy, and statistical confidence. Sample Size Floor n = 1,000 / Var Statistical significance Confidence […]