mailabbrev post expansion hook

[Uri Guttman]

i would like to have a hook called after an abbreviation expansion is
done. this is for using gnus-aliases to select an identity for a new
message. it has a hook to work with message-x but mailabbrev doesn't
seem to have anything like it. i see a function mail-abbrev-expand-hook
but it isn't a typical run hooks function, it does word wrapping after
expansion. i could add a hook call to that but is there any easier way
to get this done?

thanx,

uri