This is all I've ever used ... and it works on GoDaddy. I get the emails and user gets the confirmation.
As long as you have the correct settings in your form!
/*********************** Send Mail Configuration ****************************/
// What service is available for sending mail? Possible values are:
// - localhost [default] Server where the shop is installed, must be a Linux or Unix machine with sendmail
// - smtp A mail server of your choice that supports the standard SMTP protocol
$user_config['mailer']['service'] = 'localhost';
//$user_config['mailer']['service'] = 'smtp';
// Does the remote SMTP server need authentication?
$user_config['mailer']['smtp']['auth'] = true;
//$user_config['mailer']['smtp']['auth'] = false;
// Use this if the server needs authentication:
$user_config['mailer']['smtp']['user'] = 'name@your_domain.com';
$user_config['mailer']['smtp']['password'] = 'password';
// The address of the server
$user_config['mailer']['smtp']['host'] = 'mail.your_domain.com';
//$user_config['mailer']['smtp']['host'] = 'smtp.gmail.com';
// Connection parameters for a plain SMTP server
$user_config['mailer']['smtp']['port'] = '25';
$user_config['mailer']['smtp']['secure'] = '';
// Connection parameters for a SMTP server that supports secure connections, such as smtp.gmail.com
//$user_config['mailer']['smtp']['port'] = '465';
//$user_config['mailer']['smtp']['secure'] = 'ssl';
// What service is available for sending mail? Possible values are:
// - localhost [default] Server where the shop is installed, must be a Linux or Unix machine with sendmail
// - smtp A mail server of your choice that supports the standard SMTP protocol
$user_config['mailer']['service'] = 'localhost';
//$user_config['mailer']['service'] = 'smtp';
// Does the remote SMTP server need authentication?
$user_config['mailer']['smtp']['auth'] = true;
//$user_config['mailer']['smtp']['auth'] = false;
// Use this if the server needs authentication:
$user_config['mailer']['smtp']['user'] = 'name@your_domain.com';
$user_config['mailer']['smtp']['password'] = 'password';
// The address of the server
$user_config['mailer']['smtp']['host'] = 'mail.your_domain.com';
//$user_config['mailer']['smtp']['host'] = 'smtp.gmail.com';
// Connection parameters for a plain SMTP server
$user_config['mailer']['smtp']['port'] = '25';
$user_config['mailer']['smtp']['secure'] = '';
// Connection parameters for a SMTP server that supports secure connections, such as smtp.gmail.com
//$user_config['mailer']['smtp']['port'] = '465';
//$user_config['mailer']['smtp']['secure'] = 'ssl';
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