J: You're taking about:
<img src="http://www.spamserver.com/open.asp?id=12345"; width=1 height=1> You could regexp the body of the messsage and strip any image tags whose src attribute doesn't end in .jpg or .gif. That'll get most spammers but isapi filters can be used to trick that and still return a script file. Good spammers would catch on almost immediately and it won't hurt them b/c they don't use their servers for anything else. You'll also kill all the legitimate forms of using a script file in place of an image source, like: 1.) Random or targeted advertisements returned by the script file. 2.) We also use it at work to pass parameters to an ispai filter which calls Adobe Graphics Server and auto-resizes images for display so we can keep highres versions on the server and spit back small files for performance reasons. >> N -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ipswich Discussion Sent: Wednesday, September 03, 2003 6:30 PM To: [EMAIL PROTECTED] Subject: [IMail Forum] HTML tag re-write Spammers are using nasty trick with HTML tags like image tags that code email addresses in the src attribute's file name. For example, my email, [EMAIL PROTECTED], might be <img src="http:/www.ipswitch.com/HW4NRUOHQG.JPG"> in a HTML mail message. When the spammer's web server gets image request, it will decode the image file name, determine that my address actually opened the message and send the pretty picture. Now the spammer has a confirmed email address. Does anybody know of a way to have Imail re-write html tags so they break or not work? The mail would still be sent to the mail client, but the image tag and the like will not work. Imail will block domain names, but that is to difficult to manage for this situation. All I want to do is stop any content is not specifically in the the message itself. Some things can be done in client programs like Eudora but I have not found a way in Outlook. Also, I don't understand why Imail does not have a feature like this. Spammers have been doing this for years. Regards Joseph To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
