bind index \ca mail
macro index M ":my_hdr X-Priority: 1\n:my_hdr Importance: high\n:set dsn_return=hdrs\n:set dsn_notify=failure,delay,success\n^a" "DSN and Priority-1 classed compose of a new mail message"
macro index m ":unmy_hdr X-Priority Importance\n:unset dsn_return dsn_notify\n^a" "Standard compose of a new mail message"
bind index \ca mail
macro index M ":my_hdr X-Priority: 1\n:my_hdr Importance: high\n:set dsn_return=hdrs\n:set dsn_notify=failure,delay,success\n^a" "DSN and Priority-1 classed compose of a new mail message"
macro index m ":unmy_hdr X-Priority Importance\n:unset dsn_return dsn_notify\n^a" "Standard compose of a new mail message"