Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

Setting up, tuning and reading reports for every authentication protocol.

TLS-RPT Explained and _smtp._tls Record Setup 2026

Learn how TLS-RPT works and set up the _smtp._tls record for email security. Improve deliverability and compliance with real-time verification.

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

How Often Should You Rotate DKIM Keys? The 2026 Recommendation

Find the right DKIM key rotation schedule for 2026. Learn best practices, risks of poor rotation, and how to verify your domain's email security with real-time

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

SPF ~all vs -all: Which Is Better for Deliverability?

Discover whether SPF ~all or -all is better for deliverability. Learn how softfail vs hardfail impacts inbox placement and sender reputation in 2026.

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

DMARC ruf tag setup and why few providers send reports

Learn how to set up the DMARC ruf tag for forensic reports and understand why most email providers don’t send them. Improve your inbox placement and sender re

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

Gmail IPv6 Requirements: PTR and Authentication for Senders

Ensure your emails reach Gmail inboxes by meeting IPv6 PTR and authentication requirements. Test deliverability and prevent 550 5.7.1 errors with real-time veri

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

How to Read a DMARC Aggregate XML Report by Hand in 2026

Learn how to read a DMARC aggregate XML report by hand with step-by-step guidance. Identify delivery issues, spam sources, and authentication failures in real t

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

Message-ID Header Format Requirements and Uniqueness Rules in 2026

Ensure your emails comply with Message-ID format requirements and uniqueness rules. Verify headers, prevent delivery issues, and improve inbox placement with ac

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

TheChecker Replacement for Real-Time SMTP and DNS Checking in 2026

Find a reliable replacement for TheChecker with real-time SMTP and DNS verification. Improve deliverability, reduce bounces, and verify emails at scale with acc

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

How to Configure SPF DKIM DMARC for Outlook.com Deliverability

Ensure your emails land in Outlook.com inboxes. Learn how to configure SPF, DKIM, and DMARC correctly with step-by-step guidance and real-world testing.

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

How Email Verification Tools Assess TLS Encryption in Sender Configuration

Learn how email verification tools test TLS encryption in sender setups to prevent deliverability issues and improve inbox placement. See what happens behind th

Email authentication: SPF, DKIM, DMARC, BIMI and MTA-STS

Email Sending DNS Setup for Small Businesses Explained

Learn how to set up DNS records for email sending. Reduce bounces, improve deliverability, and avoid spam filters with a clear, step-by-step guide for small bus