improve newsletter

app/jobs/send_newsletter_job.rb

@@ -3,12 +3,23 @@ class SendNewsletterJob < ApplicationJob
   queue_as :default
 
   def perform
-    emails = Email.where('sended = 0')
-    emails.each do |em|
-      NewsletterMailer.news_mail(em.email).deliver
-      em.sended = true
-      em.save
-      sleep(6)
+    loop do
+      emails = Email.where('sended = 0')
+      break if emails.count.zero?
+      begin
+        emails.each do |em|
+          NewsletterMailer.news_mail(em.email).deliver
+          em.sended = true
+          em.save
+          sleep(6)
+        end
+      rescue Net::SMTPUnknownError => e
+        # Net::SMTPUnknownError (could not get 3xx (550: 550 5.4.5
+        # Daily user sending quota exceeded. p3sm37406639wrx.71 - gsmtp
+        Rails.logger.error e.message
+        Rails.logger.error e.backtrace.join("\n")
+        sleep(3600)
+      end
     end
   end
 end