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How to block open smtp telnet login on exchange 2013

    Question

  • HI,

    we actually have exchange 2013 and recently we found that we could use our mail server as an open relay to send mail via telnet.

    Consequently viewing this as a treat, we urgently need to remove this access.

    Any one knows to share?

    Tuesday, November 24, 2015 9:04 AM

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