Blog

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

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Email Deliverability

Why Gmail Blocks Sending After Just a Few Emails

January 16, 2026

Explanation of why Gmail blocks sending during CRM batch emails and what's actually causing it.

Email Security

2.3 million emails. One exposed API key. $10K bill.

January 13, 2026

How DMARC forensics exposed an API key leak, 2.3M unauthorized emails, and a $10K bill.

Email Security

Backscatter Injection Attacks Exploiting Legitimate Infrastructure

January 8, 2026

Attackers use backscatter emails to bypass filters, harming servers and delivering phishing content.

Email Security

Microsoft 365 Groups Bypass DMARC, Exposing Organizations to Spoofing

December 29, 2025

Microsoft 365 groups can deliver spoofed emails despite failing SPF, DKIM, and enforced DMARC policies.

Email Security

Why Subdomain DMARC Policies Are Often Unnecessary

December 25, 2025

Proper DMARC enforcement on the root domain protects non-existent subdomains without needing separate policies.

Email Security

Unexpected DMARC Reports Flood emvdmarc[.]com After Domain Acquisition

December 1, 2025

New domain emvdmarc[.]com receives DMARC reports from random organizations, creating unexpected security concerns.

Email Security

The Challenges of Enforcing DMARC p=reject in Modern Email Infrastructure

November 12, 2025

Implementing DMARC p=reject stops spoofing but often clashes with business workflows and new systems.

Email Security

How SaaS Platforms Accidentally Enable Spam and Phishing

November 12, 2025

Architectural flaws in SaaS platforms allow phishing campaigns through trusted email infrastructure.

Email Security

How a DMARC Misconfiguration Exposed Sensitive Email Data

November 6, 2025

Neglected DMARC reporting addresses can leak internal email infrastructure and sensitive organizational information.

Email Deliverability

Why Google Removed the IP Reputation Graph from Postmaster Tools

October 17, 2025

Removal limits visibility into ESP/CRM health, making it harder to monitor email deliverability risks.

Email Security

Mailchimp SPF Misconfigurations Can Expose Domains to Spoofing

October 15, 2025

Including Mailchimp IPs in root SPF unnecessarily exposes domains to spoofing despite strict DMARC policies.

Email Security

Google Postmaster v1 Deprecation: Impact on Email Deliverability and Security

October 15, 2025

Google Postmaster v1 is ending, reducing visibility into domain/IP reputation for email deliverability.