Guides
Email deliverability guides
Fix the technical reasons your email lands in spam — in plain English.
- DKIM Not Signing? How to Diagnose and Fix Missing or Failing DKIM DKIM shows none or fail in DMARC reports — the common causes (wrong selector, expired key, missing record) and how to fix each.
- DMARC p=none → p=reject: A Safe Step-by-Step Migration How to move DMARC from monitoring (p=none) to enforcement (p=reject) without blocking your own legitimate email.
- How to Fix SPF Softfail — Why DMARC Fails Even When SPF Passes SPF softfail (~all) and the alignment trap: why DMARC still fails when SPF passes, and the Return-Path fix that actually solves it.
- Gmail & Yahoo Bulk Sender Requirements, Explained (2026) What the 2024 Gmail and Yahoo sender rules actually require — SPF, DKIM, DMARC, one-click unsubscribe, and spam-rate limits — in plain English.
- How Long to Warm Up a New Email Domain? (Cold-Email Ramp Schedule) A concrete 4–8 week warm-up schedule for a new sending domain, with daily volume targets and the reputation rules that matter.
- Set Up SPF, DKIM & DMARC for Google Workspace (Step-by-Step) Exact DNS records to authenticate email for Google Workspace — SPF, DKIM (2048-bit), and DMARC — copy-paste ready.
- Set Up SPF, DKIM & DMARC for Microsoft 365 / Outlook Authenticate email for Microsoft 365 — the SPF record, the two DKIM CNAMEs (not TXT), and DMARC — with exact values.
- Fix 'SPF PermError: Too Many DNS Lookups' (the 10-Lookup Limit) SPF allows only 10 DNS lookups. Go over and SPF returns PermError and fails. Here's how to count yours and flatten the record.
- SPF vs DKIM vs DMARC: What Each One Actually Does A plain-English breakdown of SPF, DKIM and DMARC — what each record proves, how they work together, and what to publish.
- What Is a DMARC Record? Every Tag Explained (p, rua, pct, sp, aspf, adkim) A plain-English reference for every DMARC tag — what each one does, valid values, and what to set.
- Why Your Emails Go to Spam — and How to Fix It (2026) The technical reasons email lands in spam — SPF, DKIM, DMARC, reputation — and a step-by-step fix for each.