[improvement] Added configuration option for ignoring bounce notifications for certain emails (10m)

Should hopefully prevent us from trying to send bounce notifications
back to `automail@360members.com` address.

Author: kobsy

app/mailers/ep_postmaster/postmaster.rb

@@ -3,6 +3,8 @@ class Postmaster < ::ActionMailer::Base
 
     def bounced_email(options = {})
       @to = MailgunPost.unfurl(options.fetch(:original_sender) { options.fetch(:reply_to) })
+      return if EpPostmaster.configuration.ignored_bounce_emails.member?(@to)
+
       @recipient = options.fetch(:original_recipient)
       @subject = options[:original_subject]
       @error =  options[:error]

lib/ep_postmaster/configuration.rb

@@ -1,9 +1,10 @@
 module EpPostmaster
   class Configuration
-    attr_accessor :mailgun_api_key, :mailer_sender, :mailer_deliverer
+    attr_accessor :mailgun_api_key, :mailer_sender, :mailer_deliverer, :ignored_bounce_emails
 
     def initialize
       @mailgun_api_key = ""
+      @ignored_bounce_emails = []
       self.mailer_deliverer = ->(message) { message.deliver_now }
       self.bounced_email_handler = Class.new do
         def self.handle_bounced_email!(*)