[Fix] Do not cache SPF records with macros

src/libserver/spf.c

@@ -1580,6 +1580,12 @@ expand_spf_macro (struct spf_record *rec, struct spf_resolved_element *resolved,
 
 	new = rspamd_mempool_alloc (task->task_pool, len + 1);
 
+	/* Reduce TTL to avoid caching of records with macros */
+	if (rec->ttl != 0) {
+		rec->ttl = 0;
+		msg_debug_spf ("disable SPF caching as there is macro expansion");
+	}
+
 	c = new;
 	p = begin;
 	state = 0;

src/plugins/spf.c

@@ -529,7 +529,10 @@ spf_plugin_callback (struct spf_resolved *record, struct rspamd_task *task,
 
 			l = spf_record_ref (record);
 
-			if (!record->temp_failed && !record->perm_failed && !record->na) {
+			if (record->ttl > 0 &&
+					!record->temp_failed &&
+					!record->perm_failed &&
+					!record->na) {
 				rspamd_lru_hash_insert (spf_module_ctx->spf_hash,
 						record->domain, l,
 						task->tv.tv_sec, record->ttl);