Anonymous SMPT Relay (Exchange 2013)

Overview

Organizations often have the need to fax to email or scan to email. This article will explain how to setup Exchange 2013 as an anonymous SMTP relay for your internal network.

DNS Records

Create a Host(A) ecord, or Alias(CName) record that points to one of your CAS servers. I prefer to use mx.domain.tld or smtp.domain.tld.

Create the Receive Connector

• Name the Receive Connector something like 'Internal Relay'
• Set it to 'Frontend Transport'
• Set Type: Custom (For example. to allow application relay)
• Set the Scope to an internal subnet like 172.16.0.0/16

Note: Its a good idea to put your Printers/Fax/Scanner/Copiers on their own subnet/VLAN

• Under Security check the box [x] Anonymous users

Set Permissions

From the EMS run:

Get-ReceiveConnector "Internal Relay" | Add-ADPermission -User 'NT AUTHORITY\Anonymous Logon' -ExtendedRights MS-Exch-SMTP-Accept-Any-Recipient

References

http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/