Author: Ken Lowther Date: To: exim-users Subject: Re: [Exim] spam calls home
Quoting Peter Bowyer <peter@???>:
> Walt Reed wrote:
> > On Wed, Nov 26, 2003 at 05:10:02PM -0500, Richard Welty said:
> >> On Wed, 26 Nov 2003 12:21:54 -0500 Ken Lowther
> >> <hermit@???> wrote:
> >>
> >>> Many spams now call home by requesting a 'zero byte' gif when you
> >>> open the page. This is also used for other people wanting to see if
> >>> you opened the mail. Are there any rules for checking this?
> >> >
> SpamAssassin has a test called HTML_WEB_BUGS which detects these things....
>
Ah. The answer I was hoping for. Thanks. My client has "Request a Read
Receipt" and "Request Delivery Confirmation" buttons at the top. I consider
these enough for 'legitimate' users.
