%Z in hdr_format

[Martin Keseg - Sun Slovakia - SE]

hi

I'd like to know which "message status flags" are in %Z. I know there is 
r - reply
K - pgp key
P - encrypted message ....

but for example I don't know what is b. Is somewhere list with description ?
-- 
                                Keso
                              be smart,
                           don't be retard!