fix(dolist): reduce message name variability

app/mailers/application_mailer.rb

@@ -3,6 +3,8 @@ class ApplicationMailer < ActionMailer::Base
   default from: "#{APPLICATION_NAME} <#{CONTACT_EMAIL}>"
   layout 'mailer'
 
+  before_action :add_dolist_header
+
   # Don’t retry to send a message if the server rejects the recipient address
   rescue_from Net::SMTPSyntaxError do |_error|
     message.perform_deliveries = false
@@ -28,4 +30,12 @@ class ApplicationMailer < ActionMailer::Base
     Sentry.capture_exception(e, extra: { procedure_id: procedure.id })
     nil
   end
+
+  # mandatory for dolist
+  # used for tracking in Dolist UI
+  # the delivery_method is yet unknown (:balancer)
+  # so we add the dolist header for everyone
+  def add_dolist_header
+    headers['X-Dolist-Message-Name'] = action_name
+  end
 end

config/initializers/dolist.rb

@@ -6,7 +6,6 @@ ActiveSupport.on_load(:action_mailer) do
         mail.sender(ENV['DOLIST_NO_REPLY_EMAIL'])
         mail['X-ACCOUNT-ID'] = Rails.application.secrets.dolist[:account_id]
 
-        mail['X-Dolist-Message-Name'] = mail.subject # for tracking in Dolist UI
         mail['X-Dolist-Sending-Type'] = 'TransactionalService' # send even if the target is not active
 
         super(mail)