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Turn on debug mode in Roundcube webmail

Please follow the tutorial to find Roundcube config file (config/config.inc.php) first: Locations of configuration and log files of major components

Then add settings below in config/config.inc.php:

// system error reporting, sum of: 1 = log; 4 = show
$config['debug_level'] = 4;

// Log SQL queries
$config['sql_debug'] = true;

// Log IMAP conversation
$config['imap_debug'] = true;

// Log LDAP conversation
$config['ldap_debug'] = true;

// Log SMTP conversation
$config['smtp_debug'] = true;

No need to restart web service.

Roundcube is configured (by iRedMail) to log to Postfix log file, it's /var/log/maillog or /var/log/mail.log.