James Newtons Massmind wrote:

> I'm in the process of modifying the server to send back a message with a url
> to a web page that explains why the message was rejected, what to do about
> it, apologies for the false positive and gives another method of contact.

That other method of contact may be a web page that allows the person to
send a message to you using your server.

> I may extend that to the point of allowing the blocked sender to white list
> themselves... Or not... 

Or having a link in the message that is generated by the page I mentioned
above that allows you to whitelist that address with just a click.

Gerhard

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