Re: proxy firewall and email

[dwelch () uswestmail net]

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 (dwelch () phoneboy 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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