PHPMailer\PHPMailer

PHPMailer::setSMTPXclientAttribute │ public │ WP 1.0

Provide SMTP XCLIENT attributes

Method of the class: PHPMailer{}

No Hooks.

Returns

true|false.

Usage

$PHPMailer = new PHPMailer();
$PHPMailer->setSMTPXclientAttribute( $name, $value );
$name(string) (required)
Attribute name.
$value(?string) (required)
Attribute value.

PHPMailer::setSMTPXclientAttribute() code WP 6.8.1

wp-includes/PHPMailer/PHPMailer.php 
public function setSMTPXclientAttribute($name, $value)
{
    if (!in_array($name, SMTP::$xclient_allowed_attributes)) {
        return false;
    }
    if (isset($this->SMTPXClient[$name]) && $value === null) {
        unset($this->SMTPXClient[$name]);
    } elseif ($value !== null) {
        $this->SMTPXClient[$name] = $value;
    }

    return true;
}