extern void dns_build_reverse(uschar *, uschar *);
extern void dns_init(BOOL, BOOL);
extern int dns_basic_lookup(dns_answer *, uschar *, int);
+extern BOOL dns_is_secure(dns_answer *);
extern int dns_lookup(dns_answer *, uschar *, int, uschar **);
extern int dns_special_lookup(dns_answer *, uschar *, int, uschar **);
extern dns_record *dns_next_rr(dns_answer *, dns_scan *, int);