Exchange 2013: Setting up an SMTP Connector

Document created by user.oxriBaJeN4 Employee on Sep 21, 2015Last modified by user.oxriBaJeN4 Employee on Apr 2, 2019
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As a new Mimecast customer, one of the steps in setting up your account is directing all outbound email via Mimecast. This requires you to create an SMTP Connector to be configured on your Exchange Server.

Prior to us accepting outbound emails, the authorized IP addresses where emails will be sent from must be added to your Mimecast account.

Creating the SMTP Connector


To create the SMTP Connector, follow the steps below:

  1. Open the Exchange Admin Center (EAC).
  2. Click on the Mail Flow menu item in the left hand navigation panel.
  3. Click the Send Connectors link.
  4. Click the + toolbar icon. The New Send Connector wizard is displayed with the General section ready.

  5. Complete the dialog as follows:

    Field / OptionDescription
    NameEnter a name to describe the Send Connector (e.g. Mimecast Connector).
    TypeSelect the "Custom" type.
  6. Click the Next button.
  7. Select the Route Mail Through Smart Hosts option.
  8. Click the + toolbar icon. The New Smart Host dialog is displayed.
  9. Specify the Mimecast smart host's domain name for your region:


    North America

    South Africa



  10. Click the Save button.
  11. Specify the type of Smart Host Authentication. A value of "None" can be selected, as access to the smart host is restricted by the source IP address. If you choose Basic Authentication, you must provide a user name and password.
  12. Click the Next button.
  13. Click the + toolbar icon. The Add Domain dialog is displayed.

  14. Ensure that the values for the Address Space, i.e. Address = * and Cost = 1
  15. Click Save.
  16. Click Next to select a server to connect to.
  17. Click the + toolbar icon. A list of server is displayed.
  18. Select the required Server from the list.
  19. Click OK.
  20. Click Finish.
  21. Click Save.
  22. Disable or remove any other Outbound Send Connectors that were previously used. Failure to do this means your outbound email still uses these older send connectors, and is not routed through Mimecast. Any send connectors used for other purposes (e.g archiving) may still be required to be enabled. If in doubt, consult your Mimecast Support engineer.


To confirm that mail is flowing, send an outbound email to an external email address. Navigate to Accepted Email and refresh the screen until you can see the details of the email you have just sent.


See Also...