Here's a nice write up. http://www.privacyfoundation.org/resources/webbug.asp
Jim ----- Original Message ----- From: "Jim McAtee" <[EMAIL PROTECTED]> To: "CF-Talk" <[EMAIL PROTECTED]> Sent: Thursday, January 17, 2002 1:58 AM Subject: Re: Web bugs, cookies and redirects... > It's pretty simple. You send people an html formatted email message with a > reference to an image on a particular web server. There are a number of > ways to tell who has requested the image file that tells you exactly who > requested it. For instance, one way to do it might look like: > > <img src="http:\\somesite.com\[EMAIL PROTECTED]" height=1 width=1 > border=0> > > Whoever is in charge of somesite.com just checks the web server logs and > sees what references are in the logs and immediately knows which email > addresses are vailid. The really nasty thing about this is that with email > clients such as Outlook or Outlook express, merely previewing the message > will expose your email address. > > This can be a very effective technique for spammers trying to determine > valid email addrresses to be used for future spam campagns. The way to > prevent yourself from such abuse is to block your email client form using > http port 80 (or any other http port). Some personal firewalls make this > very simple. > > Jim > > > ----- Original Message ----- > From: "Andrew Scott" <[EMAIL PROTECTED]> > To: "CF-Talk" <[EMAIL PROTECTED]> > Sent: Thursday, January 17, 2002 12:05 AM > Subject: RE: Web bugs, cookies and redirects... > > > > Can you explain this web bug technique, I haven't heard it before. > > > > > > -----Original Message----- > > From: Brendan Avery [mailto:[EMAIL PROTECTED]] > > Sent: Thursday, 17 January 2002 4:13 PM > > To: CF-Talk > > Subject: RE: Web bugs, cookies and redirects... > > > > oops > > > > > i'm pretty sure that anything generated by <cfheader> would generate a > > > warning on nearly as many email clients as any kind of javascript > > > would. > > > > > > > ______________________________________________________________________ Why Share? Dedicated Win 2000 Server � PIII 800 / 256 MB RAM / 40 GB HD / 20 GB MO/XFER Instant Activation � $99/Month � Free Setup http://www.pennyhost.com/redirect.cfm?adcode=coldfusionc FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/[email protected]/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
