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.
Newest

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Modern spam filtering relies on behavior and reputation, not simple keyword detection or outdated trigger-word myths.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

Email Deliverability

Choose the Right Domain to Improve Email Deliverability

July 23, 2025

Selecting the correct domain and TLD is crucial for avoiding spam filters and improving deliverability.

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

Yahoo CFL Domains Not Recognized by Mailchimp Spam Reports

July 16, 2025

Some Yahoo-owned domains bypass Mailchimp spam report recognition, leaving unsubscribed users active.