While using the Laravel project directory, edit config/mail.php and add the following:
'stream' => [ 
              'ssl' => [ 
                        'allow_self_signed' => true, 
                        'verify_peer' => false, 
                        'verify_peer_name' => false, 
      ], 
]
Have shared my SMTP settings below:
MAIL_DRIVER=smtp 
MAIL_HOST=smtp.gmail.com 
MAIL_PORT=465 
MAIL_USERNAME=[Full Gmail Address] 
MAIL_PASSWORD=[Google App Password obtained after two step verification on Google Account Page] 
MAIL_ENCRYPTION=ssl
Hope this answers your question.