>There are a couple of these messages that bring up a good point that I'm
>unsure of: when you use "relay for address," how do you handle clients when
>you don't know their IP address?

They do SMTP AUTH, from any ip in the world.

>   That is, is there a way to make "relay for
>address" work for clients that may come through any arbitrary ISP and have
>any (unknown) IP address?

SMTP AUTH. but many ISP's will block access to port 25.

Len

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