Unwanted e-mails

From: Pat and Malcolm Bayne <av227@chebucto.ns.ca>
Date: Mon, 1 Jun 2015 13:01:07 -0300
To: "ppp-help@chebucto.ns.ca" <ppp-help@chebucto.ns.ca>
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Return-Path: <userhelp-mml-owner@chebucto.ns.ca>
Original-Recipient: rfc822;"| (cd /csuite/info/lists/userhelp; /csuite/lib/arch2html)"

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Is there anyway I can block unwanted emails before they reach my computer?
I understand that some servers offer this service by providing the Possibilities of filtering. There is an abnormally high amount of junk mail but only on chebucto. I get none on gmail. 
Malcolm 

Sent from my iPhone

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