A simple subnet wide port scan will do the trick.
On Wed, 11 Jul 2001, Juan Miguel Cacho wrote:
> En Wed, Jul 11, 2001 at 01:07:34PM +0800, Mike Blancas escribio:
> #_ It looks like 216.6.104.6 tried to relay through your server, but postfix
> #_ rejected the request.
>
> How did he find me? I'm using dialup with dynamic ip's.
>
>
_
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