X-LCID: 6252
Received: from [RDNS-HOSTNAME(93.174.64.50)] by xxx with Xeams SMTP; Thu, 6 May 2021 14:27:37 +0800 (CST)

For the last connection IP,it is better to add rDNS record,it is useful for header filter,for example,Received header contains: .dynamic.  Add score on it.