Blog

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

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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

Invalid DMARC RUA Addresses Should Be Penalized

August 1, 2025

Invalid DMARC RUA addresses harm reporting infrastructure and signal negligence toward email security standards.

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

Client Ignoring Evidence of Targeted Spoofing Attacks

July 17, 2025

A client under spoofing attack refuses to enforce DMARC despite clear phishing evidence.

Email Deliverability

Google Postmaster Updates Spam Complaint Visualization

July 17, 2025

New Google Postmaster graph helps monitor spam complaints, keeping email campaigns under compliance thresholds.

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.