[ngw] GWIA question for y'all
trevor at harrison.org
Mon Jul 23 23:35:19 UTC 2001
Eric Toll wrote:
> >We are thinking about changing this to allow the connection if and
> only if a valid >PTR record is found, not comparing it to the domain name
> So If I say Mail from: president at yahoo.com
> <mailto:president at yahoo.com> , and yahoo.com has a vaild PTR record
> then accept conversation?
> Can't you have the GWIA do a "DIG MX" or reverse DNS lookup for the
> name of the host. In your case "novell.com" If the connecting host
> sending the mail has an IP address that in not in the range of owned
> addresses by said domain, reject it.
> Morris, why is it that I can do this by hand yet GWIA cannot? /RJBS
> I'd like to take the hard line and make people config PTR records.
> Its funny how you _must_ have an MX record to get mail, but to send
> you really don't need jack $hit. Where are those RFC people...
Well, technically, you _don't_ need a MX record to receive mail... you
just have to have your smtp server on the same ip address as your domain
And, I think you've got the proposed steps misunderstood.
I don't think that they are talking about verifying any domain names in
the email message itself. I _believe_ Morris is only talking about
verifying that your outbound smtp connection's PTR record agrees with
the name given in the HELO/EHLO cmd at the beginning of the smtp
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