你好，这是什么原因？ 使用网页登录华为邮箱，无法退订。
Reporting-MTA: dns; localhost Received-From-MTA: dns; localhost Final-Recipient: rfc822; user-zh-unsubscr...@flink.apache.org Action: failed Status: 504 5.5.2 : Helo command rejected: need fully-qualified hostname Diagnostic-Code: smtp; 504 5.5.2 : Helo command rejected: need fully-qualified hostname Last-Attempt-Date: Thu, 14 Jul 2022 10:59:42 XXXXX (GMT+08:00)
