Insights on email privacy & productivity.
Tips, guides, and deep dives from the Cleanbox team.
Privacy-First Email: A Guide for the Paranoid (and the Practical)
From basic hygiene to extreme compartmentalization - a tiered guide to email privacy. What everyone should do, what privacy-conscious users should add, and what the truly paranoid need.
What Is ARC (Authenticated Received Chain) and Why Email Forwarding Needs It
ARC allows email forwarders to preserve authentication results across hops. Learn how Authenticated Received Chain works, who supports it, and why it complements SRS rather than replacing it.
Business Email Compromise (BEC): The Most Expensive Email Attack You Have Never Heard Of
Business Email Compromise costs organizations billions every year, yet most people have never heard of it. Unlike flashy ransomware attacks, BEC relies purely on social engineering - no malware, no malicious links. Learn how these attacks work, why they succeed, and how to defend against them.
Top 10 DNSBL Providers Compared: Spamhaus, Barracuda, SpamCop, and More
A practical comparison of the most widely used DNS-based blocklists. Learn how Spamhaus, Barracuda, SpamCop, SURBL, and others work, what they list, and which ones are worth using.
Why Your Email Forwarder Breaks SPF (and How SRS Fixes It)
Email forwarding breaks SPF authentication by design. Here is why it happens, what SRS does to fix it, and why this matters for deliverability.
The Unsubscribe Myth: Why That One Email Is Not the Problem
You get one bad email and hit unsubscribe. But the real question is why you were subscribed in the first place, and why unsubscribing often does not solve the actual problem.
How to Protect Your Company Email from Phishing: A Practical Guide
A layered approach to defending your business email against phishing - from DNS authentication to employee training to relay filtering.
What Email Providers Don't Tell You About Your Privacy
What Gmail, Outlook, and Yahoo actually do with your email data - scanning, tracking, metadata collection, and what you can do about it.
The Hidden Life of an Email: From Send to Inbox in 12 Steps
You click Send. The email arrives 3 seconds later. But between those two clicks, your message traveled through DNS lookups, SMTP handshakes, TLS negotiation, spam scanning, virus checks, and authentication verification. Here is the complete journey.
7 Reasons Why Your Emails Are Not Arriving (and How to Fix Each One)
Your emails are disappearing into the void. Here are the seven most common causes - from DNS misconfiguration to blacklisted IPs - and how to fix each one.
I Keep Getting Emails After Unsubscribing - Here Is Why
Still getting emails after clicking unsubscribe? Six reasons the button fails - from legal loopholes to shady tactics - and how to actually stop them.
Google and Yahoo Email Requirements: What Changed and What You Need to Do
In 2024, Google and Yahoo enforced strict authentication and unsubscribe requirements for bulk senders. Here is what you need to comply.
