Connect Application: Setting Up Recipient Validation

Document created by user.oxriBaJeN4 Employee on Oct 22, 2015Last modified by user.oxriBaJeN4 Employee on Nov 9, 2016
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Applies To...


This page applies to new clients connecting with Mimecast using the Connect Application. If you are not using the Connect Application, click here.




To ensure only messages destined for valid internal email addresses are accepted, we need to validate the recipients of all inbound email. Emails that can't be matched against a valid internal address will be rejected.


To set up recipient validation:

  1. Click the Gateway | Set Up Recipient Validation menu item.
  2. Either click the:
    • Enable Directory Users Only button to only accept emails for addresses synchronized from your directory.
      This option is unavailable if you've not completed the Synchronize Your Directory step.
    • Enable Known Addresses button to accept emails for all known addresses in your domains. This includes addresses synchronized from your directory, imported via a spreadsheet, and created manually.


A summary page is displayed showing your recipient validation setup.