Thunderbird

Thunderbird is a mature, full-featured email client that handles email, calendars, and contacts in a single application. It supports IMAP, POP3, CalDAV, and CardDAV out of the box, making it the ideal desktop client for sovereign email infrastructure built on Postfix and Dovecot.

Why Thunderbird

When your email runs on your own servers, you need a client that speaks open protocols natively. Thunderbird does exactly that, without trying to lock you into a cloud service or upsell you on premium features. It is free, open source, and actively maintained by a dedicated team with backing from the Mozilla Foundation.

Enterprise readiness

Thunderbird supports centralised configuration through policies, making it straightforward to deploy across an organisation with consistent settings. Combined with OpenLDAP for address book integration and CalDAV for shared calendars, it provides a complete groupware experience without proprietary dependencies.

Our expertise

We help companies integrate Thunderbird into their sovereign communication stack, connecting it to self-hosted email, calendar, and directory services. We advise on deployment configuration, user migration from Outlook, and the practical details that make the transition smooth.