extern uschar *dns_again_means_nonexist; /* Domains that are badly set up */
extern int dns_csa_search_limit; /* How deep to search for CSA SRV records */
extern BOOL dns_csa_use_reverse; /* Check CSA in reverse DNS? (non-standard) */
+extern int dns_cname_loops; /* Follow CNAMEs returned by resolver to this depth */
extern uschar *dns_ipv4_lookup; /* For these domains, don't look for AAAA (or A6) */
#ifdef SUPPORT_DANE
extern int dns_dane_ok; /* Ok to use DANE when checking TLS authenticity */