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NFR Wizards Archives: Re: proxy firewall and email

Re: proxy firewall and email

Subject: Re: proxy firewall and email
From: dwelchuswestmail.net
Date: Tue Jan 04 2000 - 18:20:48 CST

Exchange should be able to do some of this. Exchange 5.5 has the ability to turn off mail relaying (i.e. only send email to or from a particular domain). That way they could at least prevent people from using their SMTP server as a spam relay. It's possible the presence of Raptor may short-circuit that.

-- Dameon

On Mon, 03 January 2000, Neil Ratzlaff wrote:

> The Raptor firewall accepts all mail and passes it to the smtp server for
> delivery. If the recipient is not a valid user, the mail gets bounced by
> the smtp server, but to the address in the From field, not to the sender or
> last smtp server. Since you can put anything you want to in that field,
> you can send spam via this relay, albeit perhaps slowly. The firewall does
> not keep a list of legitimate users, so it can't reject mail as it should.
>
> I am sure other places have dealt with this process, so how can I advise
> this site to fix their setup? I would expect that Raptor should be able to
> hook into Exchange to validate recipients, but the site admin tells me it
> can't. I would be happy to tell them how to make Raptor just check that
> the recipient domain is correct, which should be easy to check. A post
> from the May99 archive of this list strongly suggests this is the correct
> way to proceed. 

--
Dameon D. Welch, a.k.a. PhoneBoy (dwelchphoneboy.com)
Check Point FireWall-1 FAQs at http://www.phoneboy.com/fw1/
The views expressed herein are not necessarily those of anyone else.
--
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