Blog

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

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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

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 Security

Massive Phishing Campaign Targets Yahoo Using Client’s Domain

September 28, 2025

Over 72,000 phishing emails exploited a past client’s domain, bypassing DMARC monitoring protections.

Email Security

How Threat Actors Exploit Redirect Chains to Bypass Spam Filters

September 25, 2025

Phishing attacks use legitimate infrastructure and redirects to obfuscate URLs and steal credentials.

Email Security

Why GoDaddy’s Enforced DMARC Policies Raise Serious Security and Privacy Concerns

September 18, 2025

Registrar-enforced DMARC breaks email delivery and exposes sensitive reporting data to third parties.

Email Deliverability

Why Email Warm-Up Is Critical for Deliverability

August 28, 2025

Sending large volumes without warming up can damage sender reputation and trigger spam filtering.

Email Security

Phishing via Compromised SendGrid Accounts Bypasses Traditional Authentication

August 22, 2025

Compromised SendGrid credentials enable phishing emails to pass authentication and impersonate trusted organizations.

Email Security

Why DMARC Reports Don’t Always Reveal Spoofing Activity

August 20, 2025

Lack of DMARC report coverage hides phishing attempts, leaving business emails vulnerable to threat actors.

Email Deliverability

Why Sudden Newsletter Volume Spikes Damage Deliverability

August 13, 2025

Large, sudden email sends trigger spam filters and quickly damage sender and domain reputation.

Email Security

Why Google Groups Can Be a Security Risk for Shared Emails

August 7, 2025

Using Google Groups for shared inboxes can expose teams to phishing and security risks.

Email Security

DMARC Reject Blocks Spoofing Attempt on Personal Domain

July 16, 2025

Strict DMARC policy prevented a spoofing attack, protecting domain despite spam filter bypass.

Email Deliverability

New SendGrid Dedicated IP Immediately Listed on DNS Blacklists

June 21, 2025

Dedicated SendGrid IPs appearing on multiple DNSBLs can hurt email deliverability and sender reputation.