rmail-set-attribute-1

rmail-set-attribute-1 is a compiled Lisp function in `rmail.el'.

(rmail-set-attribute-1 ATTR STATE)

Subroutine of `rmail-set-attribute'.
Set Rmail attribute ATTR to STATE in `rmail-attribute-header',
creating the header if necessary. Returns non-nil if a
significant attribute change was made.