Smtp auth 550 relay not permitted fix for roundcube exim4

As there are many none working answers floating on the net here is a solution that will fix the issue for most of you:   Locate the configuration file of roundcube defaults.inc.php or main.inc.php: /var/lib/roundcube/config/ (1.2) or /etc/roundcube   Then change the smtp_server: FROM $config = ‘localhost’; TO THIS $config = ‘127.0.0.1’; OR $config = ‘xx.xx.xx.xx’; (replace xx your external server IP) That should fix the issue with sending mail from roundcube.

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