diff -Naur dovecot-2.2.21.orig/src/auth/auth-penalty.c dovecot-2.2.21/src/auth/auth-penalty.c
--- dovecot-2.2.21.orig/src/auth/auth-penalty.c	2015-12-09 16:39:10.000000000 +0100
+++ dovecot-2.2.21/src/auth/auth-penalty.c	2016-02-18 18:20:31.142892375 +0100
@@ -78,6 +78,7 @@
 	} else if (sscanf(reply, "%u %lu", &penalty, &last_penalty) != 2) {
 		i_error("Invalid PENALTY-GET reply: %s", reply);
 	} else {
+#if 0
 		if ((time_t)last_penalty > ioloop_time) {
 			/* time moved backwards? */
 			last_penalty = ioloop_time;
@@ -92,6 +93,7 @@
 			drop_penalty--;
 			penalty--;
 		}
+#endif
 	}
 
 	request->callback(penalty, request->auth_request);