I need to come up with a way to restrict the address space where emails can be sent. Here is the set up: Exchange 2007 running hub transport, client access, mailbox is responsible for internal and external mail. Windows 2003 with SMTP is running on a separate computer (same domain) needs to be able to accept emails from all internal computers and relay them through exchange 2007, but should not be able to send mail to external domains. Here is what I have in mind Configure Relay Restrictions on STMP service running on W 2003 to All except the list below, and leave it blank. Create a Receive connector on Exchange 2007 and add the IP address of the 2003 SMTP server to the list of the servers from which mail can be received. Enable TLS & Externally Secured under authentication. Check Exchange servers under Permission Groups of the connector. Not sure how to restrict the address space… Can anyone suggest a solution? Thank you

You are overcomplicating this. Just setup the SMTP server on IIS in Windows 2003 to not relay email to the Exchange 2007 server for any domain other than the one you want it to. So in the list of Domains, just have the domains you want, rather than *. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

You are overcomplicating this. Just setup the SMTP server on IIS in Windows 2003 to not relay email to the Exchange 2007 server for any domain other than the one you want it to. So in the list of Domains, just have the domains you want, rather than *. Simon. Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me. how would you do that?

Hi, Because now Exchange 2007 responsible for all email external. So if you want to restrict the address space , you just need to configure Exchange 2007 send connector. It is under Organization ConfigurationàHub TransportàSend Connectors. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. it should only be restricted for mail received from windows 2003 smtp, everyone else should be able to send outside. still doable?

Hi, Because now Exchange 2007 responsible for all email external. So if you want to restrict the address space , you just need to configure Exchange 2007 send connector. It is under Organization ConfigurationàHub TransportàSend Connectors.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

For Exchange 2003 outbound restriction , you could configure Exchange 2003 connector. For Exchange 2003 inbound restriction, You can configure Exchange 2003 SMTP virtual server. Because SMTP virtual server responsible for all inbound access. It is under SMTP Virtual ServeràPropertiesàConnection ControlPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Still its being overcomplicated. The original question was how to restrict the IIS server so it only sends emails for certain domains. That is easily done by simply configuring the SMTP function on IIS to only accept email for those domains. So instead of *, each domain is listed. Ignore Exchange. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.