mh-identity-handler-top

mh-identity-handler-top is an autoloaded Lisp function in `mh-identity.el'.

(mh-identity-handler-top FIELD ACTION &optional VALUE)

Process header FIELD.
The ACTION is one of 'remove or 'add. If 'add, the VALUE is
added. If the field wasn't present, it is added to the top of the
header.