Exchange 2003 5.7.1 message refused

Paul Medway · Joined: 06 Aug 2007 Posts: 1

We have recently started to experience an intermittent email delivery
problem. Users complain when they receive and NDR to the tune of:

The following recipient(s) could not
be reached:
on 14/05/2007
13:39
You do not have
permission to send to this recipient. For assistance, contact your system
administrator.
<[Exchangeserver.domain] #5.7.1 smtp;550 5.7.1 Requested
action not taken: message refused>

I am aware of the links between this error and connection/recipient/other
Exchange filters, but we have none of these enabled. Also, I have modified
the registry to provide a custom response when this error is encountered so
as to identify if the problem is local or remote.

What is hard to understand is that you can send the same message to the same
recipient 10 minutes later and it goes with no problems.

I have examined the SMTP logs to try to gain further insight into the
problem, and have identified that the XEXCH50 section relates to the error.

As I've been writing this I have noticed that it may be related to our
configuration. We have a front-end backend environment with the frontend
configured as a smart host to the backend servers. Whenever we receive these
NDR's, the SMTP log suggests that the EHLO/HELO request is sent from our
backend server which is not allowed, but when the message is resent, it
routes correctly.

Any ideas how to stop this altogether?

Thanks

Archived from group: microsoft>public>exchange2000>transport

Leif Pedersen [MVP] · Joined: 05 Aug 2007 Posts: 193

Hi,

How did you configure the front-end server as a smart-host for your back-end
servers?

All you need to do is to create a smtp connector on the front-end server and
configure this connector to deliver all mails to the internet and only use
the fornt-end server s SMTP virtuel server. This will cause the back-end
servers to send all mails through the fe- server and never deliver directly.

Leif

"Paul Medway" wrote in message @ureader.com...
> We have recently started to experience an intermittent email delivery
> problem. Users complain when they receive and NDR to the tune of:
>
> The following recipient(s) could not
> be reached:
> on 14/05/2007
> 13:39
> You do not have
> permission to send to this recipient. For assistance, contact your system
> administrator.
> <[Exchangeserver.domain] #5.7.1 smtp;550 5.7.1 Requested
> action not taken: message refused>
>
> I am aware of the links between this error and connection/recipient/other
> Exchange filters, but we have none of these enabled. Also, I have modified
> the registry to provide a custom response when this error is encountered
> so
> as to identify if the problem is local or remote.
>
> What is hard to understand is that you can send the same message to the
> same
> recipient 10 minutes later and it goes with no problems.
>
> I have examined the SMTP logs to try to gain further insight into the
> problem, and have identified that the XEXCH50 section relates to the
> error.
>
> As I've been writing this I have noticed that it may be related to our
> configuration. We have a front-end backend environment with the frontend
> configured as a smart host to the backend servers. Whenever we receive
> these
> NDR's, the SMTP log suggests that the EHLO/HELO request is sent from our
> backend server which is not allowed, but when the message is resent, it
> routes correctly.
>
> Any ideas how to stop this altogether?
>
> Thanks

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