[15424] in North American Network Operators' Group
Re: SMTP spoofing ?
daemon@ATHENA.MIT.EDU (Perry E. Metzger)
Thu Feb 19 14:33:41 1998
To: John R Levine <johnl@iecc.com>
cc: nanog@merit.edu
In-reply-to: Your message of "Thu, 19 Feb 1998 11:52:20 EST."
<Pine.BSI.3.91.980219115057.13529A-100000@ivan.iecc.com>
Reply-To: perry@piermont.com
Date: Thu, 19 Feb 1998 12:48:03 -0500
From: "Perry E. Metzger" <perry@piermont.com>
John R Levine writes:
> Are there any routers currently available that can do port 25 spoofing for
> dialup users? That is, when the user attempts to connect to port 25
> anywhere, he in fact connects to port 25 on your own SMTP server instead.
>
> In case it's not obvious, it's for spam management.
It seems simple enough to block all outgoing SMTP to anything but your
own server, and to apply such a filter on your dialups. I don't know
if the more complex solution you propose is worth it -- the users will
quickly learn where they should aim their mail...
Perry
