emailgtw is rejecting some TLS 1.2 connections.
Any UIM/emailgtw version
https://knowledge.broadcom.com/external/article?articleId=223007
Enhancement is being tracked for emailgtw TLS 1.2 changes
DE529087 - feature number (F122605)
You can find more details in the Release Notes and the probe is available on the Beta Archive at support.nimsoft.com.