How Our Cloud Feature Prevents You from Losing That Important Document
That invoice PDF from 6 months ago? The contract your accountant emailed? Cloud extracts and stores every attachment automatically - organized by sender, searchable anytime.
Why We Built the Team Feature: Email Is Not a Solo Sport
Most email tools treat email as a personal thing. But businesses share inboxes, support addresses, and domain aliases. Here is why we built team collaboration into Cleanbox from the ground up.
Why We Built Custom Spam Symbols: Filling the Gap Between Score and Context
Rspamd is excellent at scoring email. But it does not know which senders your community trusts or distrusts. Our custom CLEANBOX_* symbols bridge that gap with crowd-sourced intelligence.
Why We Built Relay: The Problem with Traditional MX Gateways
Traditional email gateways treat every address the same. Relay was designed from scratch with per-address control, SRS forwarding, and crowd-sourced reputation.
Why We Created Shield: Your Inbox Should Respect Your Schedule
You should decide when email arrives, how much of it, and from whom. Shield gives every alias its own rate limiter, delivery schedule, and sender approval list.
What Happens When You Click Unsubscribe: The Full Technical Story
List-Unsubscribe headers, one-click POST requests, tracking pixels, preference centers, and CAN-SPAM compliance - the surprisingly complex machinery behind the unsubscribe button.
How Cleanbox Filters Work Under the Hood
A deep dive into the filter engine: 10 condition types, 12 operators, rule groups with boolean logic, and how filters interact with contact states and spam scoring.
What Happens to Your Email Before It Reaches Your Inbox?
From the moment someone clicks send to the moment it lands in your inbox - the surprisingly complex journey of an email through DNS, SMTP, spam filters, and authentication.
How We Built Contact Categorization (and Why It Changes Filtering)
Every sender is automatically sorted into one of 20 categories based on their domain. This is not just organization - it unlocks category-based filtering that works on emails you have never seen before.
