Can't set up piping across subdomains

[stormy]

I am still using Kayako 2 (I like it better than 3). I'm having a problem with IMAP fetching (I opened a separate thread), so I decided to try and setup piping.

I have Kayako on a subdomain. Piping works correctly as long as the email address is in that subdomain. If I try to pipe an address from the main domain, I get a "local delivery failed" error.

If I forward from the main domain to the Kayako address in the subdomain, tickets are not created because it's not registered as an email handler. If I register it, it only works halfway: the ticket is created but the customer doesn't receive any email notification.

So - I'm stuck here. Any help will be much appreciated.

[supportskins]

Pipe the main domain - domain.com into Kayako, forward the other domain domain2.com to domain.com and add both domain.com and domain2.com as Email Queues

Check if that works.

[stormy]

I think that's what I did. Let me use some examples to clarify:

Helpdesk: kayako.domain.com
Current pipe: support @domain.com (only works via IMAP).

-I can set-up a pipe for support @kayako.domain.com.
-But I can't set-up a pipe for support @domain.com (local delivery failed)

-If I forward support @domain.com to support @kayako.domain.com, the pipe fails (it's not an email handler).
-If I add support @domain.com as a pipe too, the pipe works (ticket is created) but the customer doesn't receive the ticket by email.

And that's where I'm stuck.