There's you answer. The other name for "Relay for local hosts only" is "Open Relay".All I can do so far is to add the clients' domain names to the "ACCEPT.LST" file and "Relay for local hosts only".
Only "No Mail Relay" and "Relay for Addresses" are safe; everything else is an open relay.
In this case, where your customers can't use SMTP AUTH, you can use "Relay for Addresses" and enter the IPs of their mailservers.
There are no users registered on this server. Now, several of these clients also useIn that case, tell them their mailserver will have to send out their mail. Tell them that they either need to pay you for an account on your mailserver, or get a static IP -- and that if they don't, you can't help them without allowing spammers to send using your mailserver.
dial-in via ISDN to connect so they are assigned an IP address dynamically, that makes it almost
impossible to set up "Relay for Addresses"
-Scott
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