Great Circle Associates Firewalls
(November 1993)
 

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Subject: Re: Configuration of mail gateway
From: "Perry E. Metzger" <pmetzger @ lehman . com>
Date: Fri, 12 Nov 1993 13:44:21 -0500
To: Amos Shapira <amoss @ cs . huji . ac . il>
Cc: firewalls @ greatcircle . com
In-reply-to: Your message of "Fri, 12 Nov 1993 18:48:55 +0200." <199311121649 . AA14666 @ picton . cs . huji . ac . il>
Reply-to: pmetzger @ lehman . com

Amos Shapira says:
> smb @
 research .
 att .
 com writes:
> |I haven't heard of it being implemented, and I'd strongly suggest against
> |it in most situations.
> 
> Why?  On the face of it it sounds ideal for a situation were you
> want to block incoming TCP connections and have an internal host
> initiate a "poll" from an outside host.

I don't see how this would increase security, but it could easily
decrease it by allowing spoofed mail interception -- and such
interception could be transparent if the spoofer then sent off the
mail anyway.

Perry


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