Multiple header entries

Hi,

What should be the policy if an MTA received a message with an spf header
already in it.
Should it remove the header and add its own, or just add a new one and leave
the original intact.
(I would assume the latter as it makes the processing history more intact).

Regards

Richard Bang
Floosietek Ltd
richard(_at_)ftgate(_dot_)com
http://www.floosietek.com