Yeah, that's what I mean. Seems like a lot of steps, doesn't it?
Maybe a better way to do this is to look at the "mail from", extract the
domain portion of the from address, and then check to see if the IP of the
connecting host is the MX for the domain of the sender. If it isn't, reject
at the point of RCPT To, otherwise accept. That wouldn't require as many
lookups in DNS at least and would be a little quicker.
Sincerely,
Rick Duvall
----- Original Message -----
From: "Matthew Byng-Maddick" <exim@???>
To: <exim-users@???>
Sent: Wednesday, October 22, 2003 6:02 PM
Subject: Re: [Exim] Refuse connection if no MX for sending host
> On Wed, Oct 22, 2003 at 05:46:47PM -0700, Rick Duvall wrote:
> > Is there a way to refuse an SMTP connection if the connecting host
doesn't
> > have an MX record in DNS? Is there a downside to doing this?
>
> How many hosts on your network have MX records ? (I'm having to assume
that
> you mean: host a.b.c.d connecting:
>
> d.c.b.a.in-addr.arpa (ptr) -> z.example.tld,...
> z.example.tld (mx) -> some.host.example.tld,...
> some.host.example.tld (a) -> a.b.c.d,...
>
> or do you not mean that? If not, your question is probably meaningless...
>
> MBM
>
> --
> Matthew Byng-Maddick <mbm@???>
http://colondot.net/
>
> --
>
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>
