>Relay mail only for local addresses (in which I have my two class C's)
>204.50.130.0 255.255.255.0
>204.50.171.0 255.255.255.0
>
>Refuse NULL senders

not advised because you mail servers bounce back to you with NULL sender

>For example, a message about a Great Free Vacation! would come from
>[EMAIL PROTECTED] and be directed to [EMAIL PROTECTED]
>
>How is this possible?

anything with mail headers is possible

>Any input would be appreciated.

Can you post one such here, not the body, but all the headers so we can see 
the delivery circuit?

Len


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