OK, that looks fine.
And, actually I now see authentication failures in the log…I missed it earlier, as there’s so many.
This one seems simple: Wrong username or password.
Check your username in the Edit Users page (depending on configuration, the username may be prueba and not prueba@consulproy.com). And, try logging in via Usermin or ssh (assuming ssh allows password authentication) to see if you’ve got the right password.
It’s possible your saslauthd configuration is broken (we alter the config to allow user@domain.tld users, if you’ve uninstalled saslauthd at some point it may have reverted to the default that doesn’t work for those users).