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Is there a way to disallow relaying emails from external domains, to external domains, in Exchange 2003?

Example:

internal.com is the only domain that this server manages.

  • I want to allow emails from internal.com to internal.com.
  • I want to allow emails from internal.com to other domains (incl. from remote locations)
  • I want to allow emails from other domains to internal.com
  • I don't want to allow emails from other domains to other domains

The server isn't an open relay, but by authenticating, it's still possible to send email from external domains to other external domains. Is there a way to prevent this?

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If you don't want to allow authenticated relaying then disable authenticated relaying on the Access tab of the properties pages of the SMTP Virtual Server.

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  • Thanks for the answer. I still need the authenticated relaying for internal users connecting from remote locations to send from the internal domain to others (2nd scenario). I'll complete the question. – Smig Jun 17 '13 at 15:29
  • Why not have the remote users use RPC over HTTP? – joeqwerty Jun 17 '13 at 15:37

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