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Modern spam filtering relies on behavior and reputation, not simple keyword detection or outdated trigger-word myths.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

Email Deliverability

Why Top-Level Domains Still Matter for Email Deliverability

July 16, 2025

Top level domain choice significantly impacts email deliverability and spam filtering outcomes for marketing campaigns.

Email Deliverability

Office 365 SMTP Issues with Proofpoint and Gmail Send Mail As

June 27, 2025

Office 365 emails fail sending via Gmail Send Mail As despite SMTP, Proofpoint, and authentication settings enabled.

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.

Email Deliverability

Analyzing Google Postmaster: Unexpected Spam Report Spikes

June 20, 2025

Google Postmaster graphs sometimes show high spam rates despite low email traffic or legitimate messages.