server IP keep blocking

icewarp mail server IP blocking is the only issue that we have been experiencing for 10+ years, never faced any other issue with icewarp.

Why was this IP listed?

A device (computer, server, mobile phone, etc), or an app on a device that is using 78.*.*.* is infected, badly misconfigured, or compromised. It is making SMTP connections with multiple unrelated HELO values on port 25.

The most recent detection was on: October 17 2024, 05:35:00 UTC (+/- 5 minutes). The observed HELO values were mail.example1.com, mail.example2.com.