Require support in ruby on rails smtp delivery method - ruby-on-rails

Question

Im trying to send a notification email to my account in gmail by using smtp delivery method when i click the place order button but i am getting all sorts of connection and authentication errors
like these:An existing connection was forcibly closed by the remote host. - SSL_connect
Net::ReadTimeout when calling ActionMailer
rails email error - 530-5.5.1 Authentication Required.
SSL_connect SYSCALL returned=5 errno=0 state=SSLv3 read server session ticket A
i have searched everywhere and everytime i try to change the port or do anything to my developments.rb file either of these errors shows up
this is my development.rb file
Rails.application.configure do
# Settings specified here will take precedence over those in config/application.rb.
# In the development environment your application's code is reloaded on
# every request. This slows down response time but is perfect for development
# since you don't have to restart the web server when you make code changes.
config.cache_classes = false
# Do not eager load code on boot.
config.eager_load = false
# Show full error reports.
config.consider_all_requests_local = true
# Enable/disable caching. By default caching is disabled.
if Rails.root.join('tmp/caching-dev.txt').exist?
config.action_controller.perform_caching = true
config.cache_store = :memory_store
config.public_file_server.headers = {
'Cache-Control' => 'public, max-age=172800'
}
else
config.action_controller.perform_caching = false
config.cache_store = :null_store
end
# Don't care if the mailer can't send.
config.action_mailer.raise_delivery_errors = false
config.action_mailer.perform_caching = false
# Print deprecation notices to the Rails logger.
config.active_support.deprecation = :log
# Raise an error on page load if there are pending migrations.
config.active_record.migration_error = :page_load
# Debug mode disables concatenation and preprocessing of assets.
# This option may cause significant delays in view rendering with a large
# number of complex assets.
config.assets.debug = true
# Suppress logger output for asset requests.
config.assets.quiet = true
# Raises error for missing translations
# config.action_view.raise_on_missing_translations = true
# Use an evented file watcher to asynchronously detect changes in source code,
# routes, locales, etc. This feature depends on the listen gem.
# config.file_watcher = ActiveSupport::EventedFileUpdateChecker
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
config.action_mailer.perform_deliveries=true
config.action_mailer.raise_delivery_errors=true
config.action_mailer.delivery_method= :smtp
config.action_mailer.smtp_settings={
:address => "smtp.gmail.com",
:port => 587,
:domain => "gmail.com",
:user_name => ENV["GMAIL_USERNAME"] ,#your gmail id
:password => ENV["GMAIL_PASSWORD"], #your gmail password
:authentication => :plain,
:enable_starttls_auto => true,
tls: true
}
end
i dont know what the hell is going on i need some help in this and currently i am getting the first error that existing connection one