Exchange 2010 how to allow unauthenticated email connections
To allow application servers, printers or other systems to send emails internal and external through Exchange 2010, use the following commands. These commands setup a receive connector and allow anonymous connections through that receive connector.
Change Receiveconnector to a name that makes sense for your environment.
Bindings dictate the specific IP address on which the receiveconnector will listen.
RemoteIPranges define the sending IP address for the printers or application servers.
Server is the name of the HUB transport server that the recevie connector will be created on.
New-ReceiveConnector -Name “Receiveconnector” -usage Custom -Bindings ’192.168.1.1:25′ -RemoteIPRanges 192.168.1.10-192.168.30.11 -server Exchange -permissiongroups AnonymousUsers
Get-ReceiveConnector “Receiveconnector” | Add-ADPermission -User “NT AUTHORITY\ANONYMOUS LOGON” -ExtendedRights “ms-Exch-SMTP-Accept-Any-Recipient”