I guess one needs more information to help you out:

• What kind CardDAV server are you using? Something like Nextcloud? DAViCal?
• How did you add CardDAV support to Roundcube? Are you using https://github.com/mstilkerich/rcmcarddav ?

To change the domain used for the user's default identity you want to change the `mail_domain` config option.

`username_domain` is used for login only and the mail_host field in the database is populated based on `imap_host`

This was the answer, thank you.

Hey Stuckbert,

as I posted before, I had the same need for such a plugin and tried the same as you without success. Therefore we developed a new plugin which should do what you need, see https://www.roundcubeforum.net/index.php/topic,30846.0.html.

TL;DR:

• Package: https://packagist.org/packages/foundata/identity_from_directory
• Repository: https://github.com/foundata/roundcube-plugin-identity-from-directory

Do not use these outdated plugins, they are all broken and/or unmaintained.

However, the active and well maintained https://git.kolab.org/diffusion/RPK/browse/master/plugins/calendar/ works perfectly fine with SabreDAV / Nextcloud and DAViCal with a little patch of kolab_dav_client.php. They only have a small error in URL parsing, leading to line-break-chars in different parts of the URL, so the request sent to the server are send wrongly. This is the only thing preventing the plugin to properly communicate with most CalDAV servers. I am going to prepare an upstream patch as well as a blog posting about the setup within the next days.

I am having an issue with new user accounts having their primary identity be created as "username@mail.example.com" when previously they were being created as "username@example.com"

It does not matter so much for authentication to the mail server, as we just look to the username, but it is confusing end users.

I am aware that username_domain should be set to "example.com" to fix this, but when I do, all older accounts lose all of their preferences and data.

I checked the mysql database and see that if I change the mail_host to example.com instead of mail.example.com for the user, I am logged in as the user_id (no new user is created on login), but my settings are gone and my contacts and collected addresses are all missing.

Is there a field other than the user_id that ties this information to the account that I can manually change to get the current users working seamlessly with their data while also having new accounts be created the way I want them?

Thank you,
Cam