After installing debian 12 and ISPconfig 3.2.10p2 When sending a message in Roundcube, this error message appears. smtp error () authentication failed Sending via Outlook and Thunderbird works. How to fix this error? Thank you
ISPConfig does not support Debian 12 yet (see list of supported OS at ispconfig.org), so you can expect all kinds of errors when using an unsupported OS version. But as at least some parts of the install seem to be working when you can log into ISPConfig and create mail accounts and them with other mail clients, so this issue might be related to RoundCube only. Check the RoundCube config file, normally RoundCube should not need to authenticate as it's installed at localhost.
