Topic
Deliverability & authentication
SPF, DKIM, DMARC, and reaching the inbox.
DMARC RFC 9989: What Changed From RFC 7489 (2026)
What changed in DMARC RFC 9989 (2026): it replaces RFC 7489, drops the pct tag, and swaps the Public Suffix List for a bounded DNS tree walk.
Nafiul Hasan
How to Add SPF, DKIM and DMARC Records in Cloudflare DNS
How to add SPF, DKIM and DMARC records in Cloudflare DNS: where TXT records live, why the proxy toggle never applies, and how to fix ones that won't resolve.
Nafiul Hasan
How to Send Cold Email Without Burning Your Domain
How to send cold email without burning your domain: send from a separate, authenticated domain, keep volume low, and watch your spam-complaint rate.
Nafiul Hasan
DMARC Rollout: Going From p=none to p=reject Safely
How to move DMARC from p=none to reject safely: monitor, fix every legitimate source, then quarantine and reject — subdomains first, parent domain last.
Nafiul Hasan
How to Fix the SPF "Too Many DNS Lookups" PermError
SPF fails with a 'too many DNS lookups' PermError once your record passes RFC 7208's 10-lookup cap. How to fix SPF too many DNS lookups, cause by cause.
Nafiul Hasan
Gmail Is Rejecting Non-Compliant Bulk Email: What Changed
Gmail rejecting non-compliant bulk email: since November 2025 it issues temporary and permanent bounces, not just spam-foldering. Which record to fix first.
Nafiul Hasan
How to Set Up SPF, DKIM and DMARC in Google Workspace
How to set up SPF, DKIM and DMARC in Google Workspace: the exact DNS values, the Admin console DKIM steps, and a safe starting DMARC record.
Nafiul Hasan
How to Set Up SPF, DKIM and DMARC in Microsoft 365
How to set up SPF, DKIM and DMARC in Microsoft 365: the exact records, the two DKIM CNAME selectors in the Defender portal, and the onmicrosoft.com step.
Nafiul Hasan
Gmail and Yahoo Bulk Sender Requirements: 2026 Checklist
Gmail and Yahoo bulk sender requirements checklist, verified August 2026: SPF, DKIM, DMARC, alignment, one-click unsubscribe, spam rate, and DNS.
Nafiul Hasan
How to Implement One-Click Unsubscribe (RFC 8058)
How to implement one-click unsubscribe (RFC 8058): the two headers, DKIM coverage, and the unauthenticated POST endpoint bulk senders now need.
Nafiul Hasan
Outlook.com High-Volume Sender Requirements: What to Do Now
Outlook.com high volume sender requirements: SPF, DKIM and DMARC are required above 5,000 messages/day, or Outlook sends your mail to Junk.
Nafiul Hasan
Why Do My Emails Go to Spam Instead of the Inbox?
Why do my emails go to spam instead of inbox? Fix it in the right order: authentication first, then reputation, engagement, and content.
Nafiul HasanEverything else in deliverability & authentication
- How to Set Up Google Postmaster Tools (Step by Step)8m
- Subdomain Strategy for Email: Marketing, Transactional, Cold9m
- How to Warm Up a New Email Sending Domain8m
- Do Spam Trigger Words Actually Matter? Myth vs Reality9m
- Why Does Cold Email Go to Spam? The Real Reasons8m
- Best Email Deliverability Tools in 2026: An Honest Roundup15m
- How to Stop Cold Emails Reaching Your Inbox (Without Losing Real Ones)9m
- Proton Mail Custom Domain: SPF, DKIM and DMARC Setup9m
- How to Add SPF and DMARC Records in GoDaddy DNS8m
- SPF Record Syntax Explained: Mechanisms, Qualifiers, Modifiers10m
- Is SPF Flattening Safe? The Trade-offs, Honestly8m
- How Often Should You Rotate DKIM Keys? A Practical Schedule10m
- How to Read a DMARC Aggregate Report (RUA XML Explained)9m
- DMARC Relaxed vs Strict Alignment: adkim and aspf Explained10m
- Am I a Bulk Sender? The 5,000-a-Day Rule, Explained8m
- Why the Gmail Unsubscribe Link Isn't Showing on Your Emails9m
- What Is a Good Spam Complaint Rate? Thresholds and Fixes9m
- What Happens If You Don't Meet Bulk Sender Requirements11m
- Do Bulk Sender Rules Apply to a Small Business?11m
- Is DMARC p=none Enough to Meet Bulk Sender Requirements?9m
- How to Read an Email Bounce Message and Find the Real Cause10m
- Hard Bounce vs Soft Bounce: How to Handle Each Correctly15m
- How to Check If Your Domain or IP Is Blacklisted9m
- How to Get Removed From an Email Blacklist (Delisting)10m
- Reading Google Postmaster Tools: Reputation, Spam Rate, Auth8m
- Microsoft SNDS: How to Use Smart Network Data Services9m
- Sudden Drop in Email Deliverability: A Diagnostic Checklist9m
- Why Does One Company Block Your Email But Nobody Else?11m
- How to Check If SPF, DKIM and DMARC Passed in Email Headers11m
- Emails Going to Spam in Outlook But Not Gmail: Why9m
- Internal Email Going to Junk in Microsoft 365: How to Fix It12m
- Dedicated IP vs Shared IP for Email Sending: Which to Pick10m
- How to Warm Up a Dedicated IP Address for Email9m
- When to Use a Separate Sending Domain (and When Not To)8m
- Self-Hosting Email: The Deliverability Reality Check10m
- Reverse DNS (PTR) for Email: Why It Matters and How to Set It9m
- How to Set Up MTA-STS for Your Domain (Step by Step)8m
- Why Forwarding Breaks DMARC — and How ARC Fixes It9m
- BIMI Implementation: Requirements, SVG and VMC Explained9m
- Do Link Shorteners Hurt Email Deliverability?9m
- Unsubscribe UX That Reduces Spam Complaints10m
- Email List Hygiene: A Practical Cleaning Checklist9m
- Double Opt-In vs Single Opt-In: The Real Trade-off11m
- Why You Should Never Buy an Email List10m
- How to Re-Engage Inactive Subscribers Without Hurting Reputation9m
- Is Inbox Rotation Safe for Cold Email? The Honest Answer8m
- How Many Cold Emails Can You Send Per Day Safely?7m
- Google Workspace and Microsoft 365 Sending Limits Compared8m
- Is Cold Email Legal? CAN-SPAM, GDPR and CASL Compared10m
- Should You Buy Separate Domains for Cold Email?10m
- Do Email Warmup Tools Actually Work? An Honest Assessment9m
- Zoho Mail SPF, DKIM and DMARC Setup: Full Walkthrough12m
- Fastmail Custom Domain: SPF, DKIM and DMARC Setup Guide10m
- How to Add SPF and DMARC Records in Namecheap DNS10m
- How to Add SPF and DMARC Records in Amazon Route 5311m
- cPanel Email Deliverability: Fixing SPF, DKIM and PTR10m
- Can You Have Two SPF Records on One Domain? (No — Here's Why)10m
- SPF ~all vs -all: Which Enforcement Rule Should You Use?17m
- DKIM Key Length: 1024 vs 2048 Bits, and What to Publish12m
- Are DMARC Forensic Reports (ruf) Worth Enabling?11m
- DMARC Subdomain Policy: How the sp Tag Actually Works10m
- Do Transactional Emails Need One-Click Unsubscribe?11m
- How Fast Must You Honour Unsubscribe Requests?10m
- Inbox Placement Rate vs Delivery Rate: Why They Differ14m
- Are Seed List Inbox Placement Tests Accurate? An Honest Look10m
- How Do You Hit a Spam Trap? Pristine vs Recycled Traps12m
- How Engagement Affects Email Deliverability (and How Much)11m
- SMTP Error Codes: A Deliverability Cheat Sheet12m
- ESP vs SMTP Relay: Which Should You Send Through?13m
- TLS-RPT Explained: Should You Enable SMTP TLS Reporting?9m
- DANE vs MTA-STS for Email: Which Should You Deploy?10m
- How to Protect a Domain That Doesn't Send Any Email12m
- Does Image-to-Text Ratio Affect Spam Filtering?10m
- How to Run a Re-Permission Email Campaign (Safely)12m
- Sunset Policy for Inactive Subscribers: How to Set One9m
- Custom Tracking Domain vs Shared: Which Should You Use?11m
- Does Plain Text Email Land in the Inbox More Often?10m
- Is no-reply@ Bad for Deliverability? What It Really Costs9m
- Does Spintax Improve Cold Email Deliverability? A Reality Check9m
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