mda_expand_format
if (mda_expand_format(mda_exec, sizeof mda_exec, deliver,
if (mda_expand_format(mda_wrapper, sizeof mda_wrapper, deliver,
ssize_t mda_expand_format(char *, size_t, const struct deliver *,
ssize_t mda_expand_format(char *, size_t, const struct deliver *,