Mail notification tools
[http://expect.nist.gov/tkbiff]
[http://www.gnt.net/%7En5ial/Tcl]
[http://www-personal.umich.edu/%7Emarkcrim/tkgoodstuff/]
[ftp://ftp.neosoft.com/languages/tcl/sorted/packages-7.6/x11/tkpostage-1.3b/tkpostage-1.3b.tar.gz]
[http://www.linux-kheops.com/pub/xbiff2/xbiff2GB.html]