diff -urN src.orig/include/spf.h src/include/spf.h
--- src.orig/include/spf.h	2012-01-28 10:24:47.000000000 +0200
+++ src/include/spf.h	2013-10-25 21:55:53.000000000 +0300
@@ -56,9 +56,9 @@
 /**
  * FYI only -- can't be changed without recompiling the library
  */
-#define SPF_DEFAULT_MAX_DNS_MECH 10	/**< DoS limit on SPF mechanisms.*/
+#define SPF_DEFAULT_MAX_DNS_MECH 64	/**< DoS limit on SPF mechanisms.*/
 #define SPF_DEFAULT_MAX_DNS_PTR	 10	/**< DoS limit on PTR records.	*/
-#define SPF_DEFAULT_MAX_DNS_MX	 10	/**< DoS limit on MX records.	*/
+#define SPF_DEFAULT_MAX_DNS_MX	 64	/**< DoS limit on MX records.	*/
 #define SPF_DEFAULT_SANITIZE	  1
 #define SPF_DEFAULT_WHITELIST	  "include:spf.trusted-forwarder.org"
 #define SPF_EXP_MOD_NAME	"exp-text"
diff -urN src.orig/include/spf_internal.h src/include/spf_internal.h
--- src.orig/include/spf_internal.h	2012-01-28 10:24:47.000000000 +0200
+++ src/include/spf_internal.h	2013-10-25 21:56:16.000000000 +0300
@@ -52,7 +52,7 @@
  * your system caused by many DNS lookups, you might not even notice
  * that you are being used as part of a DDoS attack.
  */
-#define SPF_MAX_DNS_MECH 10
+#define SPF_MAX_DNS_MECH 64
 #endif
 #ifndef SPF_MAX_DNS_PTR
 /**
@@ -66,7 +66,7 @@
  * It is a bad idea to change this for the same reasons as mentioned
  * above for SPF_MAX_DNS_MECH
  */
-#define SPF_MAX_DNS_MX    10
+#define SPF_MAX_DNS_MX    64
 #endif
 
 #if 1
diff -urN src.orig/include/spf_server.h src/include/spf_server.h
--- src.orig/include/spf_server.h	2012-01-28 10:24:47.000000000 +0200
+++ src/include/spf_server.h	2013-10-25 21:56:41.000000000 +0300
@@ -37,7 +37,7 @@
  * your system caused by many DNS lookups, you might not even notice
  * that you are being used as part of a DDoS attack.
  */
-#define SPF_MAX_DNS_MECH 10
+#define SPF_MAX_DNS_MECH 64
 #endif
 #ifndef SPF_MAX_DNS_PTR
 /* It is a bad idea to change this for the same reasons as mentioned
@@ -49,7 +49,7 @@
 /* It is a bad idea to change this for the same reasons as mentioned
  * above for SPF_MAX_DNS_MECH
  */
-#define SPF_MAX_DNS_MX    10
+#define SPF_MAX_DNS_MX    64
 #endif
 
 struct SPF_server_struct {