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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

Mailchimp Newsletter Blocked Despite Strict DMARC Policy

April 10, 2025

p=reject DMARC blocked Mailchimp emails due to DKIM failures, despite unchanged DNS and Cloudflare settings.

Email Security

Hidden SPF Abuse via Look-Alike SendGrid Domain

April 2, 2025

A typo-based SPF include exposed how look-alike domains can bypass security.

Email Security

Why Some Domains Are Heavily Spoofed While Others Are Safe

March 24, 2025

Spoofing targets depend on domain exposure, authentication gaps, and automation—not company size or staff count.

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 Deliverability

Google & Yahoo Email Regulations — June 1 Compliance Deadline

March 19, 2025

June 1 marks strict enforcement of Google and Yahoo email authentication requirements for senders.

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.