Remove obsolete smtp config

config/initializers/mail.rb

@@ -1,9 +0,0 @@
-ActionMailer::Base.smtp_settings = {
-  :address        => 'smtp.sendgrid.net',
-  :port           => '587',
-  :authentication => :plain,
-  :user_name      => ENV['SENDGRID_USERNAME'],
-  :password       => ENV['SENDGRID_PASSWORD'],
-  :domain         => 'heroku.com'
-}
-ActionMailer::Base.delivery_method = :smtp