We have this problem periodically and I have been unable to link it to any
specific event here or find a sure way to fix it.  It just happens randomly
for a week or so, then seems to clear up on its own.  I have had great
difficulty finding a cause, but tend to think that it is something going on
at the other end since it tends to only happen with specific recipients and
the message varies slightly depending on the recipient.

We get any of the messages below, depending on the recipient.  Like I said,
it's random and will work one minute and fail the next.  Restarting our
services makes no differences; I don't know of any settings of ours that
would be changing to make this happen or not.  Any ideas would be most
appreciated.  Thanks!

You do not have permission to send to this recipient. For assistance,
contact your system administrator.
<ourserver.ourcompany.com #5.7.1 smtp;550 5.7.1 user@othercompany.org>...
Relaying denied

You do not have permission to send to this recipient. For assistance,
contact your system administrator.
<ourserver.ourcompany.com #5.7.1 smtp;550 5.7.1 Unable to relay for
user@othercompany.com>

There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<ourserver.ourcompany.com #5.5.0 smtp;550 Relaying not allowed>

There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<ourserver.ourcompany.com #5.5.0 smtp;551 Message relaying to this domain
disabled>

There was a SMTP communication problem with the recipient's email server.
Please contact your system administrator.
<ourserver.ourcompany.com #5.5.0 smtp;550-EarthLink does not recognize your
computer (our IP) as connecting from an EarthLink connection. If this is in
error, please contact technical support.>

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Try this link....

http://www.interact-sw.co.uk/iangbl...xchangeproblems

Worked for us.

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