Microsoft Exchange and Active Directory Blog
Unfortunately, there are still applications or devices that can only send mails without authentication. This is not possible in the Exchange Server default setting. However, a new receive connector can be set up which allows anonymous relay for certain IP addresses. The following commands can be used on a server with an English-language operating system. Read more
Some applications or devices require an anonymous relay to be able to send mails. However, a distinction must be made here between internal relay and external relay. The internal relay, i.e. the anonymous sending of mails to the domains accepted by Exchange, works out-of-the-box: The external relay, i.e. the sending of mails to external users without authentication, however ... Read more
Some programs require an anonymous relay to be able to deliver mails. To set up an anonymous relay with Exchange 2013, a new connector should be created that has the appropriate permissions and restrictions for IP addresses: In this example, the new connector "Relay" is created: The connector can either listen on all IP addresses of the Exchange server or only ... Read more
