[twsocket] Example of reverse mx lookup with TDNSQuery

[Pete Williams]

Hi All
Does anyone know of an example of how to use TDNSQuery to do a reverse MX 
lookup? My email client is implemented with TPop3Cli.
I'm struggling with this to be honest.
The reason I have to do this is to be able to offer some kind of defense 
against SPAM in our SaaS application.
Many thanks, Pete                                         
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