This is the error:
Failed to perform SMTP command: ("503") "AUTH command used when not advertised"
Affected systems: Core/SMTP.php file (403:assert); Core/SMTP.php file (347:doCommand); Core/SMTP.php file (419:sendCommand); Core/SMTP.php file (483:sendLoginAuth); Core/SMTP.php file (625:doAuth); Core/Mailer.php file (282
penMail); Core/Mailer.php file (258:prepareQueue); Core/Dispatcher.php file (152:send); Application.php file (156:dispatch); /home/xxxxxxxx/public_html/xpay/admin.php file (26:run)