Under certain conditions the SEND TEST EMAIL functionality will not work due to restrictions on the exchange server.

This method of enabling the SEND TEST EMAIL functionality involves allowing the IIS server to relay through the Exchange server.

If you need to enable the SEND TEST EMAIL functionality on multiple exchange servers, this procedure must be repeated on those servers as well.

Create a new inbound connector

In the ECP, goto the Mail Flow settings and click on the + to create a new connector for the selected Exchange server.


Select the role and Type


Select the bindings

You may need to add the IP6 addresses to you connector. (Mail Signature will only operate on port 25)


Set the IP address for the IIS Server hosting the Mail Signature Application


Save and close the connector

Save and close the connector, the reopen the connector.

Set the Authentication

Mail Signature will attempt to authenticate if the SMTP allows it, this can cause the IIS to attempt to authenticate as the security context the Application Pool runs under.


Allow the connector to be used as a relay

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector "MailSignatureNZEX01" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient"

Test you can now send test emails

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