Have you tried using another browser? Is there any errors in the browsers JS console?

Well, not fixed after all. Back to investigating. If anyone has any ideas for what to try I'm all ears!

This issue is now fixed.

For anyone else that comes across this, removing all files in the rouncubemail/temp/ directory fixed the issue:

rm -f rouncubemail/temp/*

Roundcube is open source webmail software it is not a service. It connects to your IMAP server similar to how Outlook does. The error you describe sounds a bit strange but Roundcube has is not involved at all when you are using Outlook. I suggest you contact your email provider and tell them the exact error message you get. They might ask you for the IMAP connection details you are using to confirm they are correct as well.

Hello - how are you? I don't know if anyone can help, and please forgive me - I'm not particularly savvy when it comes to these things!

I am able to access my webmail via roundcube on my main PC via a browser, and also via Outlook on the same PC. However, using the same credentials I am unable to access my mail from any other device, phone - tablet - other PC, the login always fails. It fails when logging in via the roundcube login page OR trying to login via outlook or any other email client.

Is this a 'roundcube' issue or an I barking up the wrong tree?

Any advice appreciated.

Thanks in advance!

I've got an answer.. So please close this topic.
Thanks, Rob

We want to forward messages depending on the cc-address or the bcc-address instead of 'only'the to-address...

I still don't have an answer, but it must be some odd caching issue as you suggested @JohnDoe. When I revert back to version 1.7-beta2 and even version 1.6.10 I now get the same behavior. I'll keep investigating and report back here if I find a solution. If anyone has ideas to try, I'm all ears. fwiw, I'm running a fedora 43 server with caddy v. 2.10.2.

Thanks for the reply.

No error messages in the roundcube errors.log file, and I am not using any imap or message caching:

// config/default.inc.php
$config['imap_cache'] = null;
$config['messages_cache'] = false;

Just in case, I rebooted the entire server and the issue persists.

The issue is with LemonLDAP-NG, not with roundcube.

There is an issue with the nginx-lua-headers.conf, it messes with the cookie.