diff --git a/data/Dockerfiles/phpfpm/docker-entrypoint.sh b/data/Dockerfiles/phpfpm/docker-entrypoint.sh
index cefebcdf..37370113 100755
--- a/data/Dockerfiles/phpfpm/docker-entrypoint.sh
+++ b/data/Dockerfiles/phpfpm/docker-entrypoint.sh
@@ -172,6 +172,24 @@ BEGIN
 END;
 //
 DELIMITER ;
+DROP EVENT IF EXISTS clean_sasl_log;
+DELIMITER //
+CREATE EVENT clean_sasl_log
+ON SCHEDULE EVERY 1 DAY DO
+BEGIN
+  DELETE sasl_log.* FROM sasl_log
+    LEFT JOIN (
+      SELECT username, service, MAX(datetime) AS lastdate
+      FROM sasl_log
+      GROUP BY username, service
+    ) AS last ON sasl_log.username = last.username AND sasl_log.service = last.service
+    WHERE datetime < DATE_SUB(NOW(), INTERVAL 31 DAY) AND datetime < lastdate;
+  DELETE FROM sasl_log
+    WHERE username NOT IN (SELECT username FROM mailbox) AND
+    datetime < DATE_SUB(NOW(), INTERVAL 31 DAY);
+END;
+//
+DELIMITER ;
 EOF
 fi