Hello, In the cloudkitty-core team there is zhangguoqing, whose email address (zhang.guoqing at 99cloud.net) is bouncing with "551 5.1.1 recipient is not exist". I propose to remove them from the core team. zhangguoqing, if you read us and want to stay in the team, please contact me. Best wishes, Pierre Riteau (priteau)