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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 Security

Suspicious Google Calendar Emails Trigger DMARC Failures

May 15, 2025

Attackers exploited Google Calendar to send phishing emails, causing DMARC failures for Yahoo recipients.

Email Deliverability

Namecheap DNS TTL Limit Creates Microsoft DKIM Challenges

May 14, 2025

Namecheap’s TTL limit affects DKIM validation, risking spam filtering and degraded email deliverability.

Email Deliverability

Google/Yahoo Email Regulations: Prepare DKIM, SPF, and DMARC Compliance

May 2, 2025

Non-compliant emails face gradual rejection; ensure DKIM, SPF, and DMARC are properly configured.

Email Deliverability

Microsoft DMARC Reports Expose Recipient Domains – A Critical Risk

April 29, 2025

Microsoft DMARC aggregate reports reveal recipient domains, creating insider threats and increasing phishing risk.

Email Deliverability

Microsoft Begins Rejecting Emails Without Proper Authentication

April 29, 2025

Outlook now bounces unauthenticated emails; ensure SPF, DKIM, and DMARC are correctly configured.

Email Deliverability

Targeted Phishing Exploits Real-Time Delivery Data at Major Logistics Company

April 18, 2025

Precision phishing leveraged live DPD delivery data, exposing potential system-level breaches and GDPR risks.

Email Security

Why Email Security and Compliance Matter More Than Authentication

April 17, 2025

Domain authentication alone doesn’t guarantee deliverability; security and compliance are critical for email success.

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 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.