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<?php
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, 'https://api.mailgun.net/v3/filebot.net/messages');
    curl_setopt($curl, CURLOPT_RESOLVE, ['api.mailgun.net:443:34.149.236.64']);
    curl_setopt($curl, CURLOPT_TIMEOUT, 10);
    curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
    curl_setopt($curl, CURLOPT_USERPWD, $key);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_POSTFIELDS, [
        'from'         => $from,
        'to'           => $to,
        'subject'      => $subject,
        'text'         => $text,
        'attachment'   => new CURLStringFile($attachment, $filename)
    ]);
 
    $response = curl_exec($curl);
    $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
 
    if ($status != 200) {
        error_log('[MAILGUN] '.$status.' '.(curl_errno($curl) ? curl_error($curl) : $response));
    }
 
    curl_close($curl);
?>