Apache 1.3.33 strange log entry

From: stefanPL (stefanet_at_poczta.onet.pl)
Date: 02/28/05 

Date: 28 Feb 2005 13:56:16 -0800

I found this strange entry in my Apache log, can anyone explain it to
me and tell me is it dangerous and how can I secure against it?

61.31.158.236 - - [28/Feb/2005:22:39:29 +0100] "CONNECT
news98.idv.tw:25 HTTP/1.0" 200 3853 "-" "-"

I guess someone is trying to use my computer as a mail server, but I
don't have mail server installed. Maybe there is a Windows XP hole that
makes it possible to use Win XP as a mail server remotely or sth like
that.

My computer is visible on the Internet on port 80 (www), I use it to
test my web pages and show them to other testers so I need externeal
(static) IP number.
My Apache 1.3.33 also has PHP 4.3.9 support.

Please advise
Chris