====== Exchange Local SMTP Relay ======

===== Exchange 2016 =====

Be default, Exchange will not relay mail for anonymous users.  **This complicates sending mail from local appliances such as a PBX or copier.**

==== Add a Local Relay Receive Connector ====

Here we add a new Receive Connector "Local Relay" that permits a short list of devices (IP addresses) permitted to relay mail without authentication.  If you add a new appliance that needs to send mail, do not configure SMTP Authentication.  Add its IP address to the list of permitted devices instead.

**Exchange Admin Center -> Mail Flow -> Receive Connectors**

{{ :internet:mail:exchange:exchange_local_relay_connector_1.png?600 |Add a new Receive Connector}}

{{ :internet:mail:exchange:exchange_local_relay_connector_2.png?600 |Bind it to port 25}}

{{ :internet:mail:exchange:exchange_local_relay_connector_3.png?600 |Delete the default range of permitted IPs}}

{{ :internet:mail:exchange:exchange_local_relay_connector_4.png?600 |Add the IP addresses of permitted devices}}

{{ :internet:mail:exchange:exchange_local_relay_connector_5.png?750 |New Local Relay Receive Connector}}

===== Exchange 2007 =====

http://www.chicagotech.net/netforums/viewtopic.php?f=1&t=7156

By default, the Default Receive Connector will not relay mail for anonymous users or devices.  They get an error like:

''530 530 5.7.1 Client was not authenticated (state 13)''

==== Enable Anonymous users in Default connector under Hub Transport ====

  - Go to Hub Transport under Server Configuration in Exchange Management Console.
  - On the Receive Connectors tab double-click the Default connector.
  - On the Permission Groups tab make sure that your Exchange Server has the following boxes checked:
    * Anonymous users
    * Exchange users
    * Exchange servers
  - On the Authentication tab, make sure that you uncheck the box under Basic Authentication that says “Offer Basic authentication only after starting TLS.”
  - Restart Hub Transport service.