Relay issue with forwarding emails

Hi I have an Exchange 2003 Server. I need to forward emails for an eixting user to another email address.

I have created a contact in Active Directory with the new email address and set the users account to forward emails to this contact. The cntact address is a different domain.

I am getting a error "#5.5.0 smtp;550 Relaying not allowed [id:HSWC6TD894WNP]> #SMTP#" on the forwarding.

How do I get around this without making my server an open relay?

Thanks
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Optima SystemsNetwork EngineerAsked:
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
Is it on a different domain but in the same forest. ie the other domain owned by your company
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TMekeelCommented:
Are you using Exchange connectivity in the client or POP/SMTP?
If you are using SMTP check to make sure you are authenticating.
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Optima SystemsNetwork EngineerAuthor Commented:
The exchange server is authenticating as it sends mail through a 3rd party scanning company.

The exchange account receives the emails to the address and then forwards it out. The domain in not owned by this company it is a different domain all together.
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Simon Butler (Sembee)ConsultantCommented:
The method of forwarding that Exchange does through a Contact forward will make it look like your server is spoofing the original sender. The email is being rejected by your third party host because the email appears to be coming from another domain altogether - the original sender.
This is not a fault with your Exchange server, but also it isn't something you can resolve easily.
The only method would be to use an automatic forward rule on the mailbox (Rather than a contact), but this means you have to allow automatic forwarding for the entire org, and all email the target gets will be from the same sender (the internal mailbox).

Simon.
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Optima SystemsNetwork EngineerAuthor Commented:
Hi Simon

Will I have the same problem if I setup a rule in outlook on the exchange account (which still exists for the user) and forward all mail form there rather than doing it at the Exchange Manager panel?
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Simon Butler (Sembee)ConsultantCommented:
No, but you do have the issues I outlined - in that you have to allow the entire org to do automatic forwarding and the messages would appear to come from the same sender. Personally I don't allow automatic forwarding unless I have no other choice. Much better to get the email collected from Exchange directly.

Simon.
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Optima SystemsNetwork EngineerAuthor Commented:
Hi Simon

Thanks for that. I have decided to stop the old address being collected by Exchange and will create a POP3 mailbox on the hosting server for it and forward it from there. So it wont actually come into exchange and I don't have a relay issue.

Thanks for the advice.
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