just a quick-and-dirty article…
In order to allow sending mails to external recipients from your internal network without authenticating against your Exchange Server, for example a scanner, you have to do two things:
- create a receive connector (front-end-transport and internal) and specify from which IP-address(es) the connector should receive mails. For security reasons, please do not specify your entire network, or your Exchange could easily be used for sending hundreds of spam mails.
- use the Powershell:
Get-ReceiveConnector "NAME OF YOUR RECEIVE CONNECTOR" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient"
on German systems you have to use „NT-Autorität\Anonymous-Anmeldung“
If you don’t follow the steps above you’ll get a relaying denied error.