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From: Clunk Werclick on 9 Sep 2009 03:11
On Wed, 2009-09-09 at 07:16 +0100, Steve Heaven wrote:
> On Wed, 2009-09-09 at 00:27 +0200, mouss wrote:
> > Steve Heaven a écrit :
> > >
> >
> >
> > the old: "try to pass to next, until final server accepts or rejects"
> > is n more acceptable. recipients must be checked at the "edge".
> >
> > postfix provides reject_unverified_recipient to help you for that
> > (assuming the next relay really validates the recipient).
>
> That's the problem. Most of our clients that we relay mail for run
> Microsoft SBS Exchange which doesnt verify probes. It accepts mail for
> any user and sends an undeliverable report back to the sender.

Are you saying that it is not possible to configure it to reject users
that don't exist at the SMTP level? Are you *sure*? So if you telnet in
to it and send mail for anyoldrubbish(a)domain.co.uk it accepts it?

I would be gobsmacked. Surely this is a simple configuration issue ?
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From: Steve Heaven on 9 Sep 2009 03:39
On Wed, 2009-09-09 at 08:11 +0100, Clunk Werclick wrote:

> Are you saying that it is not possible to configure it to reject users
> that don't exist at the SMTP level? Are you *sure*? So if you telnet in
> to it and send mail for anyoldrubbish(a)domain.co.uk it accepts it?
>
> I would be gobsmacked. Surely this is a simple configuration issue ?

It may well be possible, but the default seems to be to accept any user.

Almost all our client's SBS servers (there are about 50 of them) are
managed by non-IT staff, usually just someone in the office who knows
add users, change passwords etc, but little else. So asking them to make
detailed configuration changes is out of the question.

Steve


--
thorNET
Internet Services, Consultancy & Training
www.thornet.co.uk

From: Mikael Bak on 9 Sep 2009 04:02
Steve Heaven wrote:
> On Wed, 2009-09-09 at 08:11 +0100, Clunk Werclick wrote:
>
>> Are you saying that it is not possible to configure it to reject users
>> that don't exist at the SMTP level? Are you *sure*? So if you telnet in
>> to it and send mail for anyoldrubbish(a)domain.co.uk it accepts it?
>>
>> I would be gobsmacked. Surely this is a simple configuration issue ?
>
> It may well be possible, but the default seems to be to accept any user.
>
> Almost all our client's SBS servers (there are about 50 of them) are
> managed by non-IT staff, usually just someone in the office who knows
> add users, change passwords etc, but little else. So asking them to make
> detailed configuration changes is out of the question.
>

Read "Step 2: Configure recipient filtering in Exchange Server 2003":

http://support.microsoft.com/default.aspx?scid=kb;en-us;886208

If I were you I'd write up a nice howto for my clients describing the
problem and asking them to do these easy configuration steps. And then
both you and your clients will be good internet citizens.

Just my 2 cents.

Have a nice day,
Mikael
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