Thierry, > More info - DidTheyReadIt.com > ...<img src="http://e-mail-servers.com/....jpg" ... width="1" height="1"> Is that in any way different from http://en.wikipedia.org/wiki/Web_bug ? Cheers, Paul Szabo psz at maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia