Fix: Find mailbox with cc email (#4372)

app/finders/email_channel_finder.rb

@@ -0,0 +1,15 @@
+class EmailChannelFinder
+  def initialize(email_object)
+    @email_object = email_object
+  end
+
+  def perform
+    channel = nil
+    recipient_mails = @email_object.to.to_a + @email_object.cc.to_a
+    recipient_mails.each do |email|
+      channel = Channel::Email.find_by('lower(email) = ? OR lower(forward_to_email) = ?', email.downcase, email.downcase)
+      break if channel.present?
+    end
+    channel
+  end
+end