Webone blocking port 25??

Martijn van Oosterhout kleptog at svana.org
Fri Jul 26 12:03:10 EST 2002

On Fri, Jul 26, 2002 at 10:47:47AM +1000, Alex Satrapa wrote:
> On Friday, July 26, 2002, at 09:31 , Jeremy wrote:
> > They do, of course, authenticate relaying by IP, but also by valid 
> > domain name.  The interesting bit is that they don't give an SMTP error 
> > when they do so.  They acept the mail then drop it later.
> Ahh... now *that* is something to get on their back about.  That's 
> definitely not what I would expect.

Strange. Exim definitly verifies it while receving the message
(receiver_try_verify and sender_try_verify if you're interested) and will
reject the message by returning a 550 *after* having received the DATA. If
you don't check till later, you have the problem of sending a bounce message
because the from address was, uh, fake :)

220 sambucca.ecomtel.com.au ESMTP Exim 3.35 #2 Fri, 26 Jul 2002 12:00:41 +1000
HELO kleptog
250 sambucca.ecomtel.com.au Hello malibu.ecomtel.com.au []
MAIL FROM: martijn at fake.mail.address
250 <martijn at fake.mail.address> is syntactically correct
RCPT TO: whhaat at also.fake.address
250 <whhaat at also.fake.address> is syntactically correct
354 Enter message, ending with "." on a line by itself
550 rejected: cannot route to sender <martijn at fake.mail.address>

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.

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