I can not send a message to gmail using PHP on Windows

I have this error that I can do I can not send a message to gmail by php windows

  

Could not execute: / usr / sbin / sendmail

-language: php
php:
  - 7.0
  - 5.6
  - 5.5
  - 5.4
  - 5.3
  - hhvm

matrix:
  allow_failures:
    - php: hhvm

before_install:
  - sudo apt-get update -qq
  - sudo apt-get install -y -qq postfix
before_script:
  - sudo service postfix stop
  - smtp-sink -d "%d.%H.%M.%S" localhost:2500 1000 &
  - mkdir -p build/logs
  - cd test
  - cp testbootstrap-dist.php testbootstrap.php
  - chmod +x fakesendmail.sh
  - sudo mkdir -p /var/qmail/bin
  - sudo cp fakesendmail.sh /var/qmail/bin/sendmail
  - sudo cp fakesendmail.sh /usr/sbin/sendmail
  - echo 'sendmail_path = "/usr/sbin/sendmail -t -i "' > $(php --ini|grep -m 1 "ini files in:"|cut -d ":" -f 2)/sendmail.ini
script:
  - phpunit --configuration ../travis.phpunit.xml.dist
after_script:
  - wget https://scrutinizer-ci.com/ocular.phar
  - php ocular.phar code-coverage:upload --format=php-clover ../build/logs/clover.xml

these are the pages where the error is

 public $Sendmail = '/usr/sbin/sendmail';






public function isSendmail()
    {
        $ini_sendmail_path = ini_get('sendmail_path');

        if (!stristr($ini_sendmail_path, 'sendmail')) {
            $this->Sendmail = '/usr/sbin/sendmail';
        } else {
            $this->Sendmail = $ini_sendmail_path;
        }
        $this->Mailer = 'sendmail';
    }






public function testMailSend()
    {
        $sendmail = ini_get('sendmail_path');
        //No path in sendmail_path
        if (strpos($sendmail, '/') === false) {
            ini_set('sendmail_path', '/usr/sbin/sendmail -t -i ');
        }
        $this->Mail->Body = 'Sending via mail()';
        $this->buildBody();

        $this->Mail->Subject = $this->Mail->Subject . ': mail()';
        $this->Mail->isMail();
        $this->assertTrue($this->Mail->send(), $this->Mail->ErrorInfo);
        $msg = $this->Mail->getSentMIMEMessage();
        $this->assertNotContains("\r\n\r\nMIME-Version:", $msg, 'Incorrect MIME headers');
    }