Exchange 2013 Relay issue

Hi,

I'm tired of banging my head against the wall.

Scenario :
A users email (mailbox) will have forwarded only mails containing pdf,xml and tif to another email address. The other mail is an mail contact (outside organization)

Setup :
2 Exchange 2013 in DAG
Smarthost as SMTP


Have tried using mail rules with criteria : Recipients containing given attachment, set CC to other mail contact (outside organization)

This works when using internal objects. For all external objects it seems to have some issues with relaying.

Looking through the logs at smarthost i see that the mail is recieved at smarthost and sent as it should. The mail arrives at Exchange and never returns to the smarthost.

So, Any suggestion for how to solve this issue ?
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Mr WooberAsked:
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Andy MConnect With a Mentor IT Systems ManagerCommented:
Sounds like it's simply a case of your server is not setup for relaying on the recieve connector the external email is coming in on so when the external email comes in, the exchange immediately tries to forward it to another external address but because your server is not setup to allow relaying to a non-authorative (external) domain, it fails.

Internal email will work fine as it's forwarding the email to a domain that it has authoriative control over so it's not actually relaing, just redirecting to another internal address.

Setting up relaying should allow this to work but be careful as incorrectly setting up relaying can open your server up to be used for spamming.

http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/
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Mr WooberAuthor Commented:
Thanks :)
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