TLP Mail Marker

Apply FIRST TLP 2.0 markings to outgoing email in Roundcube Webmail. No tracking, no external servers.

Apply FIRST TLP 2.0 markings to email you compose in Roundcube Webmail. Choose TLP:CLEAR, TLP:GREEN, TLP:AMBER, TLP:AMBER+STRICT or TLP:RED, and add consistent subject and body markings before sending. TLP Mail Marker helps you remember classification and notice changes in handling requirements. It can warn or block when a message has no classification, and warn when a reply or forward would lower the original classification. Settings let you choose approved levels, a default level, marking style and an organisation profile. Works with Roundcube Webmail. Add your own webmail hostname and approve access for that site. It starts with no access to websites; access is requested only for hosts you choose. This is not a Gmail or Outlook extension. Email processing stays on your device. No developer servers, analytics, tracking or remote code. Your settings are stored locally. TLP labels communicate sharing boundaries; they do not encrypt email, enforce recipient behaviour or replace your organisation’s security policy. Open-source under the MIT licence. Support and private vulnerability reporting are available through the project on GitHub.