I found some strange log recectly,my version is: Version: 7.3-3,the log is as below:
Apr 18 19:00:08 postfix pmgproxy[1125188]: detected empty handle
Apr 18 19:00:13 postfix pmgproxy[1125188]: detected empty handle
Apr 18 19:00:18 postfix pmgproxy[1125188]: detected empty handle
Apr 18 19:00:23...