General

Understanding message statuses

Learn what each message status means and what actions you can take.

How quarantine works

Why emails end up in quarantine and how to review, release, or delete them.

Managing contacts and unsubscribing from newsletters

How contacts are discovered, categorized, and how one-click unsubscribe works.

How long are messages stored at Cleanbox?

Understand how message retention works and how long your emails are retrievable.

How does contact categorization work?

How Cleanbox automatically categorizes your contacts based on sender domains.

How does Cleanbox detect spam?

A look at Rspamd, sender reputation, IP blacklists, and the spam scoring system.

What happens when you receive an email?

The complete journey of an inbound email through Cleanbox - from SMTP to delivery.

What is SPF, DKIM, and DMARC?

A simple explanation of the three email authentication standards and why they matter.

How to protect your email address from data breaches

Practical steps to minimize exposure when services you use get hacked.

How cloud storage and attachment extraction works

How Cleanbox automatically saves email attachments to the cloud, organized by contact.

How relay email processing differs from aliases

The technical differences between how Cleanbox handles relay addresses and alias addresses.

Understanding the spam scoring system in detail

How Rspamd scores are calculated, what Cleanbox custom symbols mean, and how user feedback improves detection.

How one-click unsubscribe works

How Cleanbox detects newsletter subscriptions and unsubscribes you with a single toggle - including what happens behind the scenes.

Understanding your dashboard and analytics

What the cleaning score, delivery breakdown, top senders, and message chart on your dashboard mean - and how to read them.

How spam training works

How your spam and legitimate feedback trains the filter for you and all Cleanbox users - and when to use it.

Understanding message properties

What the property badges on your messages mean - multi-sender, CC, BCC, newsletter, encrypted, and 9 more.

How to forward and re-deliver messages

How to forward a message to an external address, re-deliver a failed message, and release quarantined email.

How to read a spam report

Every message has a spam report showing exactly which rules triggered and how the score was calculated. Here is how to interpret it.

Searching and filtering your messages

How to search messages by subject, sender, or content, and filter contacts by state or category.

Bulk actions: managing messages and quarantine at scale

How to accept or reject multiple quarantined messages at once, and other bulk operations in Cleanbox.

Downloading and exporting your data

How to download individual messages, attachments, and what data you can export from Cleanbox.

How DNS blacklists (DNSBL) work

What DNSBL is, how IP addresses end up on blacklists, which providers Cleanbox checks, and how to handle false listings.