我相信你需要的是phpmailer_init 行动挂钩。

这是你可以做的一件事。

add_action( \'phpmailer_init\', \'custom_smtp_settings\' );

function custom_smtp_settings( $phpmailer ) {

    $phpmailer->isSMTP();

    switch ($_SERVER[\'HTTP_HOST\']) {

        case \'example1.com\': //name only, no http
            $phpmailer->Host = \'smtp.example1.com\';
            $phpmailer->SMTPAuth = true; // Force it to use Username and Password to authenticate
            $phpmailer->Port = 25;
            $phpmailer->Username = \'example1\';
            $phpmailer->Password = \'example1pass\';

            // Additional settings…
            $phpmailer->SMTPSecure = "tls"; // Choose SSL or TLS, if necessary for your server
            $phpmailer->From = "[email protected]";
            $phpmailer->FromName = "Example One";
            break;

        case \'example2.com\':
            $phpmailer->Host = \'smtp.example2.com\';
            $phpmailer->SMTPAuth = true; // Force it to use Username and Password to authenticate
            $phpmailer->Port = 25;
            $phpmailer->Username = \'example2\';
            $phpmailer->Password = \'example2pass\';

            // Additional settings…
            $phpmailer->SMTPSecure = "tls"; // Choose SSL or TLS, if necessary for your server
            $phpmailer->From = "[email protected]";
            $phpmailer->FromName = "Example Two";
            break;
    }

}