register.c :

int
invalid_email(addr)
char   *addr;
{
        FILE   *fp;
        char    temp[STRLEN], tmp2[STRLEN];
        if ((fp = fopen(".bad_email", "r")) != NULL) {
                while (fgets(temp, STRLEN, fp) != NULL) {
                        strtok(temp, "\n");

                        strtolower(genbuf, temp);
                        strtolower(tmp2, addr);

        if (strstr(tmp2, genbuf) != NULL || strstr(genbuf,tmp2) != NULL ) {
                                fclose(fp);
                                return 1;
                        }
                }
                fclose(fp);
        }
        return 0;
}
--
FROM 202.116.130.100