uschar *cc_local_part; /* caseful local part */
uschar *lc_local_part; /* lowercased local part */
uschar *local_part; /* points to cc or lc version */
uschar *cc_local_part; /* caseful local part */
uschar *lc_local_part; /* lowercased local part */
uschar *local_part; /* points to cc or lc version */