Blog

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

Thank you! Your submission has been received!

Oops! Something went wrong while submitting the form.

Email Security

Why Enforcing Broken DMARC Models Harms Email Security and Deliverability

September 18, 2025

Forced DMARC subdomain records break standards, hide reports, and weaken customer email security visibility.

Email Security

Why Downgrading DMARC Policies Puts Brands at Risk

September 16, 2025

Downgrading DMARC from reject to none enables spoofing and increases phishing exposure.

Email Deliverability

Office 365 “Send Mail As” Issues with Proofpoint and Gmail

September 13, 2025

Gmail Send Mail As fails with Office 365 and Proofpoint despite SMTP, MFA, and credentials configured.

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 “Low-Volume” Spoofing Is Still a Serious Risk

August 20, 2025

Even minimal spoofing activity can enable targeted phishing and serious security incidents.

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 “Spam Trigger Words” Don’t Actually Exist

August 20, 2025

Modern spam filtering relies on behavior and reputation, not simple keyword detection or outdated trigger-word myths.

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

How a Single DMARC Misconfiguration Can Trigger an Email-Based DDoS

August 6, 2025

Wildcard DMARC EDV records can be exploited, flooding mailboxes with thousands of legitimate-looking reports.

Email Security

Phishing Attempt Exploits Server Without SPF or DMARC

July 24, 2025

Phishing attack on vertigo360.me highlights risks when SPF and DMARC policies are missing.