SPF, DKIM, DMARC and BIMI: A Plain-English Setup Guide for Cold Email
What each email authentication record does, how they work together, and the exact DNS entries you need before sending your first cold email.
Topic
Authentication
Practical guides on cold email infrastructure, inbox placement and building a CRM that fits your business.
Setting Up Secondary Domains for Cold Email: Naming, Redirects and DNS
Why cold email should never run on your main domain, how to choose outreach domains, and the exact setup checklist we use for each one.
DMARC Fails Even Though SPF and DKIM Pass? It's an Alignment Problem
SPF and DKIM can both pass while DMARC fails. The reason is alignment. Here's how to read your headers and fix it in a few minutes.
SPF PermError: Too Many DNS Lookups. What It Means and How to Fix It
Your SPF record can only trigger 10 DNS lookups. Here's how to count them, why going over breaks SPF completely, and three clean ways to fix it.
Gmail, Yahoo and Outlook Sender Requirements: What Cold Emailers Actually Need to Do
Plain-English summary of the bulk sender rules from Google, Yahoo and Microsoft, and what they mean for cold outreach teams.