Omitting Email originating IP from the header

Luis Gonçalves <[email protected]> Tue, 1 Dec 2015 12:05:10 +0000

Newsgroups	gmane.mail.cgatepro.general
Message-ID	<[email protected]>

Dear All

       Anyone knows how to omit the "Email originating IP" of the header 
of my sent emails?

I want to have that option. Gmail already does that.

Thanks

Luis Gonçalves

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