Serializza gli invii SMTP su una coda unica per non far chiudere Aruba.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/jobs/resume_mailings_job.rb

@@ -1,28 +1,16 @@
 class ResumeMailingsJob < ApplicationJob
   queue_as :mailers
 
-  STALE_QUEUED_AFTER = 10.minutes
-
   def perform
-    recover_stale_queued!
     Mailing.sending.due_to_send.find_each do |mailing|
       next unless Mailings::SendClock.new(mailing).open?
-      next if mailing.mailing_recipients.queued.exists?
 
       recipient = mailing.mailing_recipients.pending.order(:id).first
       next unless recipient
 
       SendMailingRecipientJob.perform_later(recipient.id)
     end
-  end
 
-  private
-
-  def recover_stale_queued!
-    MailingRecipient.queued.where("updated_at < ?", STALE_QUEUED_AFTER.ago).find_each do |recipient|
-      next unless recipient.mailing.sending?
-
-      recipient.update!(status: "pending", error_message: nil)
-    end
+    DrainOutboundJob.perform_later if Mailings::OutboundQueue.queued_scope.exists?
   end
 end