module Roda::RodaPlugins::ErrorEmail::InstanceMethods

def error_email(exception)

the email.
instance, but it can be a plain string which is used as the subject for
Send an email for the given error. +exception+ is usually an exception 
def error_email(exception)
  email_opts = self.class.opts[:error_email].dup
  email_opts[:message] = error_email_content(exception)
  email_opts[:emailer].call(email_opts)
end