How to handle forwarded e-mails in Rails ActionMailbox?

Question

We are using Rails 7 to build an application which, amongst other features, should perform some actions when e-mails are sent to one of its e-mail addresses (which have, for instance, the format ticket-{uuid}@ourdomain.com ).

Rails' ActionMailbox's routing works fine for direct e-mails. However, when e-mails are forwarded, they are not recognized by ActionMailbox at all.

How can we ensure that forwarded e-mails are also handled and routed correctly with ActionMailbox?

---

EDIT: A simplified version of the code we are using:

class ApplicationMailbox < ActionMailbox::Base  
  routing /^ticket-(.+)@ourdomain.com$/i => :service_tickets
end

class ServiceTicketsMailbox < ApplicationMailbox
  def process
    puts "processing email: #{mail.inspect}"
    # ... and then we extract its fields
    # and store some of them in the database.
  end
end

Answer 1

The API never includes functionality to see any other mail-address than the latest one in the delivery stack. The only option the API offers by itself is to use InboundEmail::source to get the raw message for further parsing.

After this process I could imagine to use RoutingJob to forward the mail to the correct receiver.

I'm not sure if Callbacks could help.

Also concerning MessageId I don't know if it's possible to extract the correct Ids.

As far as I see the whole challenge requires at least some work and I see there no simple solution.

Answer 2

Ok I think I found the issue:

When you send a normal e-mail the To header looks like this To: ticket-123@@ourdomain.com and this matches with /^ticket-(.+)@ourdomain.com$/i

However when you forward the e-mail the header looks like this To: John Doe <ticket-123@ourdomain.com> and this will not match with your regex.

Change the regex to /ticket-(.+)@ourdomain.com/i and it should work.

You can try it out on https://regexr.com/