Folks,
I need to prepend the rails environment to the subject of all outgoing messages in Rails. I did little dig around and find out that the real message is created in "vendor/rails/actionmailer/lib/action_mailer/base.rb" on line 467
def create_mail m = TMail::Mail.new
m.subject, = quote_any_if_necessary(charset, "#{RAILS_ENV} - #{subject}")