full-disclosure - strange from address

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Message-ID: <1065526128.21866.5.camel@xwing.starwars.co.za>
From: jamesd at staff.intekom.com (James Devine)
Subject: strange from address

Hi all,

We currently run qmail 1.03 and will only accept mail on a valid mx
query. but I have noticed something strange happening. If you insert the
following string into the mail from: field #@[] it appears to by pass
the mx check and replys ok.

Any ideas comments