[SOLVED] Error "Sorry, sending the message to request your confirmation failed" but not when logged as the admin

ℹ️ Support
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hi Guys!
i am still getting same message. already working on it 4 hours. no result. please check.
first i tried

define(‘PHPMAILERHOST’, ‘mail.smtp2go.com’);
define(‘PHPMAILERPORT’,2525);
define(‘PHPMAILER_SECURE’,true);
// SMTP Authentication
$phpmailer_smtpuser = ‘yyyyyyyy’;
$phpmailer_smtppassword = ‘xxxxxxxxx’;

then i tried:
define(‘PHPMAILERSUBSCRIBEHOST’,‘’);
define(‘PHPMAILERHOST’, ‘mail.smtp2go.com’);
define(‘PHPMAILERPORT’,2525);
define(‘PHPMAILER_SECURE’,true);
// SMTP Authentication
$phpmailer_smtpuser = ‘yyyyyyyy’;
$phpmailer_smtppassword = ‘xxxxxxxxx’;

then tried:

define(‘PHPMAILERSUBSCRIBEHOST’,‘’);
define(‘PHPMAILERHOST’, ‘here-also-same-server’);
define(‘PHPMAILERPORT’,465);
define(‘PHPMAILER_SECURE’,true);
// SMTP Authentication
$phpmailer_smtpuser = ‘yyyyyyyy’;
$phpmailer_smtppassword = ‘xxxxxxxxx’;
//define(‘PHPMAILERPORT’,‘465’);
define(‘PHPMAILER_SECURE’,‘ssl’);

and some other variants.
no works. please help