15 articles
How email open tracking works: spy pixels, link wrapping, click tracking. Best practices for ethical tracking and better deliverability.
How to detect SaaS tools sending emails from your domain without authorization: DMARC reports, unknown source identification, resolution workflow, and continuous monitoring.
Complete guide to email-related DNS records: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, PTR. Each record explained with concrete examples.
How to read email headers: Received, Return-Path, Authentication-Results, ARC, DKIM-Signature. Complete guide to diagnosing deliverability issues.
Step-by-step guide to moving your DMARC policy from none to reject: recommended timeline, shadow IT pitfalls, the role of RUA reports, and a migration checklist.
Practical guide to interpreting DMARC aggregate reports: XML format, legitimate vs suspicious sources, shadow IT, and how to use the data to strengthen your policy.
Everything about email encryption: STARTTLS, opportunistic vs enforced TLS, MTA-STS, DANE, TLS-RPT. Why Gmail shows a red padlock and how to avoid it.
Complete dissection of a DKIM-Signature header: algorithm, body hash, canonicalization, selector, timestamp. Understanding the verification process step by step.
Technical explanation of dual DKIM signatures: why your ESP adds its own signature, the role of Gmail and Yahoo Feedback Loops, and the impact on DMARC alignment.
Complete guide to BIMI (Brand Indicators for Message Identification): prerequisites, VMC certificate, DNS setup and impact on trust.
Complete guide to setting up a DMARC record on your domain: syntax, policies, RUA reports and best practices.
Everything about email blacklists (RBL/DNSBL): how they work, why your IP or domain is listed, and how to get removed step by step.
Understand the factors that influence your email deliverability: IP reputation, DNS authentication, content, engagement and monitoring.
Complete guide to DKIM (DomainKeys Identified Mail): how cryptographic signatures work, DNS setup, key rotation and troubleshooting.
Everything you need to know about SPF (Sender Policy Framework): syntax, mechanisms, the 10 DNS lookup limit, and step-by-step configuration.