What is APRF? Aggregate Performance Reporting, Explained Simply
What is APRF? A new email standard that emails senders inbox-placement and engagement reports - like Google Postmaster Tools, but from any mailbox provider.
TLS Certificates Are Shrinking to 47 Days - and Your Mail Stack Is on the Clock
Public TLS certificate lifetimes are dropping from 398 to 47 days by 2029 - the 200-day cap is already in force. What it means for MX, MTA-STS, TLS-RPT and BIMI, and the 5-step plan to get ahead of it.
BIMI Setup Guide: How to Add Your Brand Logo to Emails
Set up BIMI step by step - the DNS record, the SVG logo rules, VMC vs CMC certificates, and what Gmail, Yahoo and Apple Mail require in 2026 - plus how to get BIMI implemented if you would rather work with a consultant in India.
Microsoft Email Deliverability: The Complete Debugging Guide (2026)
The complete 2026 guide to Microsoft email deliverability: 15 bounce codes decoded, compauth/SCL headers from real captures, SNDS, escalation paths, and fixes per sender type.
DKIM Replay: Why a Valid Signature Doesn't Prove the Sender
A DKIM replay attack re-sends one validly signed message to millions and it still passes. How replay works, a safe lab to see it, and how DKIM2 fixes it.
What Is a DMARC Aggregate Report? (And How to Actually Read One)
A provider dropped an unreadable XML file in your inbox? Here is what a DMARC aggregate report is and how to read one, field by field, with a worked example.
Email Domain Health Check: 8 Checks Every Domain Needs
Run a free email domain health check and understand every result. MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI and DNSSEC explained simply, with the...
SPF, DKIM & DMARC Guide: Modern Email Authentication Protection
Learn how to implement SPF, DKIM, and DMARC to protect your domain from email spoofing. Complete step-by-step guide with examples and best practices...
Preparing for Changes in Email Tracking and Privacy Regulations in 2025
Stay ahead of the 2025 email tracking and privacy regulation changes. Learn how Gmail, Apple, and Microsoft are altering email tracking, why open rates...
Parsedmarc - Open source DMARC report analyzer and visualizer
Let's learn about ParseDMARC. An open source DMARC analyzer - alternative to commercial DMARC report processing tools.
What is an SPF record?
An SPF (Sender Policy Framework) record is used to indicate which hosts are authorised to send emails for a domain. It is defined in RFC 4408 and...
What is a DMARC record ?
DMARC stands for “Domain-based Message Authentication, Reporting & Conformance.” DMARC is built upon two other authentication protocols: SPF (Sender...