The plugin looks good. One thing I don't see is a way to switch to light / default mode in case there is a message that needs to be view in the original form.

I wrote a plug-in for RoundCubeMail 1.7 that patches dark-mode to work in the message viewer and the message editor.

I hope someone can use it as well as myself.

rpc-scandinavia/rpc_rcm_patches: Packagist page

/etc/roundcube/debian-db.php is not the default location for the Roundcube config, and because the error has "(using password: NO)" indicates that it likely not reading the config file at all assuming that there is a database password.

My guess is that was a change made in the package from your distro and its no longer checking the custom config location.

Moin,

roundcube has been working flawlessly on my computer for many years. I hadn't used it for a while now because I was using MUA on my laptop. In the meantime, there were a few updates on my server, including the upgrade from Debian 12 to 13.

Now Roundcube isn't working anymore. Error in /var/log/roundcube/errors.log:

Quote[26-Mar-2026 13:26:55 +0000]: <43a93627> DB Error: SQLSTATE[HY000] [1045] Access denied for user 'roundcube'@'localhost' (using password: NO) in /usr/share/roundcube/program/lib/Roundcube/rcube_db.php on line 202 (GET /roundcube/?_task=mail&_mbox=INBOX)

The settings in /etc/roundcube/debian-db.php are correct, however, the file has not been edited since 2022.

Installed:

root@boulder ~ # dpkg --list | grep roundcube
ii roundcube-core 1.6.13+dfsg-0+deb13u1 all skinnable AJAX based webmail solution for IMAP servers
ii roundcube-mysql 1.6.13+dfsg-0+deb13u1 all metapackage providing MySQL dependencies for RoundCube
ii roundcube-skin-classic 1.6.0+ds-3 all skinnable AJAX based webmail solution for IMAP servers - classic theme
ii roundcube-skin-larry 1.6.1+ds-3 all skinnable AJAX based webmail solution for IMAP servers - Larry theme

Any hint?

Quote from: alec on March 24, 2026, 02:41:44 AMhttps://github.com/roundcube/roundcubemail/issues/10121

O, many thanks!

This patch actually fixed the problem. I pointed AI to this link; It didn't know the solution until now.

The indication that the problem was in versions 1.6.12 and 1.6.13 is my mistake. The problem only appeared in 1.6.14, as far as I understand.

G'day for all!

After upgrading roundcube to 1.6.12 (1.6.13, 1.6.14, too) we can't do serching in folders in Russian (non ASCII symbols).

QuoteServer error: UID THREAD: Error in IMAP command UID THREAD: Missing LF after literal size (0.001 + 0.000 secs).

Search is only possible in English (ASCII). Where error from?

This is now solved. I was being affected by an already-reported roundcube bug

I fixed as suggested by the bug reporter by setting
mail_attachment_detection_options="" in dovecot.conf

The other largest attack vector I see is social engineering where emails are sent saying there are coming from "Roundcube". A simple and quick fix would be to change the name and logo shown to users so they are less likely to click on links claiming to be from Roundcube.

That fact that you referenced upgrading Ubuntu both breaking the Roundcube and fixing it, are you installing Roundcube from the Ubuntu package? If so I have seen that in the past they change the Roundcube config location so that maybe why you saw it not pickup your SMTP settings and why the skins disappeared if it overwrote them while updating the package.