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Practical insights on email deliverability, security, and infrastructure — based on real findings from working with 450+ organizations.

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Email Deliverability

Yahoo Rejecting Forwarded Emails Due to Authentication Failures

March 20, 2025

Yahoo appears to reject forwarded emails due to authentication and header modification issues.

Email Security

How a Rare 3-Character Domain Exposes the Reality of Email Spoofing

March 14, 2025

Even small, lightly-used domains can be exploited for spoofing, phishing, and scams without owner knowledge.

Email Deliverability

Avoid Homoglyphs in HTML to Prevent Email Spam Issues

March 13, 2025

Ensure email HTML templates avoid homoglyphs to prevent spam filters blocking legitimate marketing emails.

Email Security

Spoofed AppSheet Email Highlights Limits of DKIM, SPF, and DMARC

March 13, 2025

Threat actors abused AppSheet to send phishing emails that passed DKIM and DMARC checks.

Email Security

Why Email Open Rates and Click-Through Rates Can Be Misleading

March 12, 2025

Open and click rates don’t always reflect true engagement—manual replies tell the real story.

Email Deliverability

Mailchimp Sending Non-Authenticated Emails Despite DKIM and DMARC

March 1, 2025

Mailchimp rejects emails due to DMARC p=reject, sending 100% non-authenticated despite DKIM setup.

Email Security

Email Security is the Foundation of Email Deliverability

February 21, 2025

DKIM, SPF, and DMARC form the foundation for secure email delivery and prevent spoofing.

Email Security

Microsoft and Google DMARC Reports Ignore Syntax Errors

February 21, 2025

DMARC aggregate reports continue despite significant syntax errors, as Microsoft and Google overlook issues.

Email Deliverability

How to Safely Manage High-Volume Email Campaigns

February 12, 2025

Avoid sudden email spikes; warm up your server to maintain deliverability and domain reputation.

Email Deliverability

Yahoo Postmaster Updates Help Monitor Spam Reports Effectively

February 12, 2025

Yahoo Postmaster tool now tracks individual spam complaints, helping marketers maintain low complaint rates.

Email Deliverability

Why You Should Avoid Hosting DNS Zones with Wix

February 5, 2025

Wix DNS limitations prevent adding MX records, affecting email authentication and deliverability for platforms.

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