relaying denied

Hi.

Somewhat sporadically, and under <1% of total, at least a few messages a
week get bounced back with a message similar to the following:

> Your message did not reach some or all of the intended recipients.
>
> Subject: XXXX
> Sent: 8/11/03 4:09 PM
>
> The following recipient(s) could not be reached:
>
> 'xxx@yyy.net' on 8/11/03 4:10 PM
> You do not have permission to send to this recipient. For
assistance, contact your system administrator.
> <SBSERVER.mydomain.org #5.7.1 smtp;550 5.7.1 <xxx@yyy.net>...
Relaying denied>

This started happening some months ago. Some weeks are worse than others,
some email addresses worse than others. Sometimes if user A sends it to
email address X outside the domain, it always gets bounced, whereas if user
B sends it to the same email address it goes just fine. It happens
significantly more often if someone sends an email as a delegate, on behalf
of another user.

SBS is running SP4, Exchange has SP3 and I have tried re-running ICW and
checking a few other things. Server doesn't seem to be an open relay of any
kind.

Any help greatly appreciated.

Thanks,

Josh

Josh
Tue Aug 12 22:47:38 CDT 2003

Dana,

Thanks very much for the response.

The email addresses we are sending to are legitimate small business email
addresses.
Like us, many are local nonprofits.

More detail: These relaying problems started some months back. Before then,
no problems were had sending any email to any of these addresses which now
sometimes give troubles. When I say sometimes, I mean sometimes messages do
go through to these same email addresses; certain emails give more troubles
than not. For some specific email addresses, which are legitimate addresses
of associates, emails always go through when sent by user A, but sometimes
bounced when sent by user B, and almost always get bounced when sent as a
delegate, or on behalf of say, user A.

Qwest is the ISP, although before we switched to qwest a couple months ago
we were using Speakeasy as an ISP. The relay problems started before the
switch.

Finally, my apologies for not giving specific domains on usenet, though I
would be more than happy to mail you them personally if are able to help
further with that information.

Thanks again for your reply and any further help,

Josh


"Dana Becker [MSFT]" <danabeckonline@microsoft.com> wrote in message
news:<ytxrIePYDHA.2528@cpmsftngxa06.phx.gbl>...
> Hello Josh,
>
> Are the recipients you are receiving NDR's from valid users you are trying
> to send email to, or do they appear to be SPAM addresses? Can you give me
a
> few examples of the domains you are trying to send to (without the
> username) as well as your SMTP domain?
>
> Also, what is your connection to the Internet and what ISP are you using?
> Some companies have been blocking email from certain IP addresses/ISP's in
> order to cut down on SPAM messages, and we want to make sure that is not
> the problem you are experiencing.
>
> Regards,
>
> Dana Becker
> Microsoft Small Business Server Support