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I'm having a hard time getting Exchange relaying the mail from my applications to external domains.

I have setup a recieve connector as Hub Transport Custom connector.

  • Externally secured (for example, with IPsec)
  • Exchange Servers
  • Anonymous Users

I have no clue what i did wrong.. I can send to internal Accepted domains but not outside of my company.

Thanks in advance,

Kevin

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in addition to allowing anonymous clients on the custom connector, you also need to grant relay permission to anonymous clients. You can do this with the following powershell cmdlet:

Get-ReceiveConnector "Anonymous Relay" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient"

Be careful to somehow scope or protect this connector so that it is not available to the public.

More info can be found here: TechNet - Allow Anonymous Relay on a Receive Connector

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  • I had done that. The eventual problem was a port misconfiguration unfortunately. – djkevino May 24 '15 at 1:44

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