Configurable URLs

Each mailbox now has configurable URL that you can manage in settings.

And side panels also support configurable titles. (Set the title in your server's HTML response.)

Thank you @cweagans for all your help on making this happen!

Fix draft emails

Fixes the issue when opening a (deleted) draft

More data fields

This release adds more data fields.

One of the field's name changed, so this is a breaking release.

Additionally, data was hardened against possible encoding attacks. So this upgrade is recommended for everybody. We now use JSON encoding to protect data movement from PHP to JavaScript.

Initial public release

This is the first public release. Enjoy.