Webone blocking port 25??

[Martijn van Oosterhout]

On Thu, Jul 25, 2002 at 08:25:51PM +1000, Chris Fletcher wrote:
> NetSpeed don't care what you put in the from field.  They protect their mail
> server based on the originating IP address.  Much smarter to do it that way.

Actually, you can setup mail servers to check that the domain in the from:
field exists using a DNS lookup with temporary failure being considered OK.

I can assure you this cuts down on the number of incorrectly configured
customer setups. If they mistype their reply address, their mailer will tell
them the moment they try to send an email. Rather than three weeks later
while you have them on the phone.

> ----- Original Message -----
> From: "Jeremy" <jepri at webone.com.au>
> To: "Conrad Canterford" <conrad at mail.watersprite.com.au>
> Cc: <linux at lists.samba.org>
> Sent: Thursday, July 25, 2002 8:19 PM
> Subject: Re: Webone blocking port 25??
> 
> 
> >
> > > Not true. You can be assured that webone at least are checking the IP
> > > range the email comes from and not the name stated in the From:
> > > header.
> > > I know this, because my mail goes through their server, but my domain
> > > is
> > > not in any way set up by them or administered in any way by them. They
> > > don't have any knowledge of it.
> >
> > Complete and utter bullshit.  A week ago I received a message from the
> > webone technical support explaining that my mails were being dumped
> > because they had an invalid domain in the from line.
> >
> > You might mean that webone are checking that the name in the From: line
> > contains a valid domain name.
> >
> >
> >
> >
> 
> 

-- 
Martijn van Oosterhout   <kleptog at svana.org>   http://svana.org/kleptog/
> There are 10 kinds of people in the world, those that can do binary
> arithmetic and those that can't.