rmail-add-mbox-headers

rmail-add-mbox-headers is a compiled Lisp function in `rmail.el'.

(rmail-add-mbox-headers)

Validate the RFC2822 format for the new messages.
Point should be at the first new message.
An error is signaled if the new messages are not RFC2822
compliant.
Unless an Rmail attribute header already exists, add it to the
new messages. Return the number of new messages.