interesting pattern

Thomas Shaddack shaddack at ns.arachne.cz
Thu Dec 11 15:53:15 PST 2003


It's a test if you aren't running an open proxy. Its purpose is antispam.


On Thu, 11 Dec 2003, An Metet wrote:

> I have noticed this lately:
>
> When someone sends mail to user at thisdomain.com , shortly thereafter a query comes from the ISP that runs the outgoing SMTP and loads http://www.thisdomain.com.
>
> The query does not load any images, just the base html page. It comes from IP usually in the same cloud as outgoing SMTP.
>
> Sometimes this happens only after the first mail from that ISP to thisdomain.com, sometimes every time.
>
> Is this anti-spam (why querying the recipient?), or some data harvesting and connecting the dots?





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