filter for header line

MAYER Hans <[email protected]> Tue, 5 Sep 2017 11:15:40 +0000
Newsgroups gmane.mail.mimedefang
Message-ID <[email protected]>


Dear mailing list members,

I am looking for a possibility to filter for an existing header line. 
I found a lot of examples where $Subject, $Sender and others can be used. 
But I need the possibility to find a certain header line, for example  X-Someinfo: 
Can someone point me to some examples. 
I was searching at Google but obviously with the wrong keywords. 

Kind regards 
Hans

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