SMTP error 535 authentication failed in roundcube OR SMTP Error (435): Authentication failed


If you face SMTP error 535 Authentication Failed while sending an email from round cube, then you can check the following things.

vi /usr/local/cpanel/base/3rdparty/roundcube/config/main.inc.php
and change
$rcmail_config['smtp_user'] = '%u';
to
$rcmail_config['smtp_user'] = '';
Save the file
FIXED....

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