OpenSSL::SSL::SSLError (hostname "smtp.gmail.com" does not match the server certificate)

When I deployed my rails app with cent os6 while sending email it is giving me 'OpenSSL::SSL::SSLError (hostname “smtp.gmail.com” does not match the server certificate) ,

This is my mailer settings config.action_mailer.smtp_settings = { address: ‘smtp.gmail.com’, port: 587, domain: ENV[‘DOMAIN_NAME’], authentication: ‘plain’, enable_starttls_auto: true, user_name: ENV[‘GMAIL_USERNAME’], password: ENV[‘GMAIL_PASSWORD’], openssl_verify_mode: ‘none’ }

Let me know if any one can help . Thanks in advance.