I'm trying to setup my exchange 2010 to relay to outside email addresses for printers and UPS software and such. I have setup a new receive connector, added a alternate IP to the box and used that. Also added the Get-ReceiveConnector "External Relay" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "ms-Exch-SMTP-Accept-Any-Recipient" command for it. I can't get it to do anything when I try to telnet and test it. Do the exchange services need to be restarted for it to work? I get 500 5.3.3 unrecognized commands when I run the mail from: email@example.com..