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Just today I've started to see in my web-server logs lines like this:

IP_WITHHELD - - [19/Oct/2011:20:47:04 +0000] "GET /providers/bookings HTTP/1.1" 500 21975 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
IP_WITHHELD - - [19/Oct/2011:20:47:43 +0000] "GET /providers/bookings HTTP/1.1" 500 21976 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"

I don't run Live Mail, however. Someone is hitting my servers with the Host header set to, as you can see. What purpose does this serve?

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up vote 3 down vote accepted

That's not the host header, that's the referrer.

It means that someone clicked on a link in an email (or loaded a resource embedded in an email) that sent them to your site from the site.

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Right you are; thank you. I misread the log entry. – troutwine Oct 19 '11 at 21:48

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