Message Tracking Server Lookup

This one-liner outputs the NSLOOKUP results of the servers who connected to this server to send messages with a particular subject. Very useful for determining which server to block or allow explicitly based on messages you've received.

Get-MessageTrackingLog -MessageSubject "SomeTextFromTheSubject" | Group ClientIP | Select Name | nslookup $_

Provides great output formatted like this:

> Server:  yourdnsserver.domain.local
Address:  192.168.1.1

Name:    smtpserver.senderdomain.com
Address:  1.2.3.4

> Server:  yourdnsserver.domain.local
Address:  192.168.1.1

Name:    smtpserver2.senderdomain.com
Address:  1.2.3.5