Custom headers in gnus for replies

[Andi Kleen <ak@muc.de>]

Hi,

I'm using gnus to read mailing lists which have been gated to newsgroups.
The news gateways are one way - when I want to reply I have to mail
to the original recipients.

The gateway software allows this by inserting headers like

X-Mailing-List: list-address
X-Original-Cc:  original cc list

Currently I always edit the reply mails by hand and cut and paste the list
from X-Original-cc and X-Mailing-List. Due to the arcane mail header syntax
this sometimes leads to corrupted lists, especially when the cc list 
is complex and was spread over multiple lines.

Is there a way to get gnus to do this for me? Basically I just want 
it to interpret X-Mailing-List as another From/Cc (to be inserted
in the recipient list with group reply) and process the X-Original-Cc
like a normal cc header.

Is there any easy way to do this? 

Thanks in advance,

-Andi