feat: Display sent status of emails in email channel (#3125)

app/workers/email_reply_worker.rb

@@ -0,0 +1,14 @@
+class EmailReplyWorker
+  include Sidekiq::Worker
+  sidekiq_options queue: :mailers
+
+  def perform(message_id)
+    message = Message.find(message_id)
+
+    return unless message.outgoing? || message.input_csat?
+    return if message.private?
+
+    # send the email
+    ConversationReplyMailer.with(account: message.account).email_reply(message).deliver_later
+  end
+end