^^&&^^

Edit File: MandrillHandler.php

<?php declare(strict_types=1);

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Monolog\Handler;

use Monolog\Logger;
use Swift;

/**
 * MandrillHandler uses cURL to send the emails to the Mandrill API
 *
 * @author Adam Nicholson <adamnicholson10@gmail.com>
 */
class MandrillHandler extends MailHandler
{
    protected $message;
    protected $apiKey;

/**
     * @param string                  $apiKey  A valid Mandrill API key
     * @param callable|\Swift_Message $message An example message for real messages, only the body will be replaced
     * @param string|int              $level   The minimum logging level at which this handler will be triggered
     * @param bool                    $bubble  Whether the messages that are handled can bubble up the stack or not
     */
    public function __construct(string $apiKey, $message, $level = Logger::ERROR, bool $bubble = true)
    {
        parent::__construct($level, $bubble);

if (!$message instanceof \Swift_Message && is_callable($message)) {
            $message = call_user_func($message);
        }
        if (!$message instanceof \Swift_Message) {
            throw new \InvalidArgumentException('You must provide either a Swift_Message instance or a callable returning it');
        }
        $this->message = $message;
        $this->apiKey = $apiKey;
    }

/**
     * {@inheritdoc}
     */
    protected function send(string $content, array $records): void
    {
        $mime = 'text/plain';
        if ($this->isHtmlBody($content)) {
            $mime = 'text/html';
        }

$message = clone $this->message;
        $message->setBody($content, $mime);
        if (version_compare(Swift::VERSION, '6.0.0', '>=')) {
            $message->setDate(new \DateTimeImmutable());
        } else {
            $message->setDate(time());
        }

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://mandrillapp.com/api/1.0/messages/send-raw.json');
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
            'key' => $this->apiKey,
            'raw_message' => (string) $message,
            'async' => false,
        ]));

Curl\Util::execute($ch);
    }
}