Problem with forwarding to external contacts with Exchange 2007

Hello,

I have a bizarre issue where an Exchange 2007 server is unable to forward email to external contacts. I've added mail contacts and added them into the mail flow properties of a mail user, selecting to keep a copy in the users mailbox...

What happens is that I get an NDR with the following information:

Generating Server: server.domain.local

external@contact.com
mail.btconnect.com #550 Not permitted
##rfc822;administrator@domain.com

I've tested this by sending an email to administrator@domain.com - I can see by using Outlook Web Access, the administrator@domain.com receives the test message and then receives an NDR into the same inbox with the above error.

Any ideas please?

Thank you!
puterssupportAsked:
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TheCleanerCommented:
The error seems to point to btconnect not allowing relay for the domain you are sending from.  Is the FROM address for the email on the same domain that is allowed through BT's server?

The NDR just basically points to a relay issue, which you shouldn't really have if the idea is to just create a mail contact and set the mail flow properties to forward the email to them.
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puterssupportAuthor Commented:
Hello,

Mail flow through BTconnect works fine, except for the forward element, which is utterly bizarre. The reply address is the same, although, I've read elsewhere that there is spoofing involved in forwarding?

Anyway - I've implemented  a workaround routing emails via DNS and setting up a reverse DNS record.
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TheCleanerCommented:
OK, did you contact BTconnect about it?  Maybe they can tell you why it is failing and if there really is spoofing taking place.  I've never had a problem myself with forwarding to external contacts and we use a 3rd party as well (MessageLabs).
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puterssupportAuthor Commented:
I've spoken with BT - they want to charge us to support us as they declare that the problem must be with our setup, even after explaining that it works fine when BTs SMTP servers are not part of the equation !
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puterssupportAuthor Commented:
Accepted own answer as workaround was implemented myself.
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TheCleanerCommented:
You should have actually accepted your own answer then.  Better for the community, just saying.

See here:  http://www.experts-exchange.com/Community_Support/Announcements/Q_23577377.html
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