Convergent builds its mail service on free software and sends its fixes upstream. Twelve pull requests accepted by SnappyMail and Tachyon: address book sync, message HTML sanitising, two-factor authentication, calendar invitations and LDAP directories.
A new open source SnappyMail plugin from Convergent: accept, tentatively accept or decline an invitation from the message view, with the reply produced by the CalDAV server (RFC 6638). Design, cancellations and SEQUENCE revisions, limits.
Contact synchronisation between SnappyMail and Cyrus IMAP. Why we forked Mailbux's CardDAV plugin: a hardcoded URL rewritten at every login, and a two-way sync force-re-enabled on each sign-in — and why that last one destroys contacts.
Calendars in the SnappyMail webmail, backed by Cyrus IMAP's DAV. Why we forked Mailbux's CalDAV plugin, what we fixed (URL as configuration, RRULE, VALARM, CSP) and how invitations are delegated to the server (RFC 6638).