--- a/src/global/mail_params.h	2024-02-20 16:37:05.000000000 +0100
+++ b/src/global/mail_params.h	2024-03-22 00:04:31.689504363 +0100
@@ -2932,7 +2932,7 @@
 extern char *var_verify_service;
 
 #define VAR_VERIFY_MAP			"address_verify_map"
-#define DEF_VERIFY_MAP			"btree:$data_directory/verify_cache"
+#define DEF_VERIFY_MAP			"lmdb:$data_directory/verify_cache"
 extern char *var_verify_map;
 
 #define VAR_VERIFY_POS_EXP		"address_verify_positive_expire_time"
@@ -3748,7 +3748,7 @@
   * postscreen(8)
   */
 #define VAR_PSC_CACHE_MAP	"postscreen_cache_map"
-#define DEF_PSC_CACHE_MAP	"btree:$data_directory/postscreen_cache"
+#define DEF_PSC_CACHE_MAP	"lmdb:$data_directory/postscreen_cache"
 extern char *var_psc_cache_map;
 
 #define VAR_SMTPD_SERVICE	"smtpd_service_name"