char *seqfile = concat(toabsdir(folder), "/", mh_seq, (void *)NULL);
FILE *fp = fopen(seqfile, "r");
char *msgnums = NULL, *this_msgnums, *old_msgnums;
char *seqfile = concat(toabsdir(folder), "/", mh_seq, (void *)NULL);
FILE *fp = fopen(seqfile, "r");
char *msgnums = NULL, *this_msgnums, *old_msgnums;