Web Reference: If you get "Authentication failed" error, set auth_verbose = yes and log_debug = category=auth in dovecot.conf, restart Dovecot and try again. The log file should now show enough information to help you fix the problem. Dec 1, 2024 · I'm running dovecot 2.3.21 with Ubuntu 24.04.1 LTS. I'm trying to configure the server to work with both virtual and local users. Virtual users are working fine, but I'm having trouble authenticating a local user when trying to retrieve email using a client like Roundcube. Basically this happens any time I open my web mail or the mail client. I can see the emails, I can receive new emails and everything, the password and user is right, but yet the log keeps showing it as being a failure. What authentication methods are you using?
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