SAUCE (Software Against Unsolicited Commercial Email) is an SMTP server that sits between the Internet and your actual mail software. It was originally written to help in the fight against spam, but it also helps encourage good configuration and administration in general.

SAUCE has various tactics for reducing incoming spam:



SAUCE is not a users' mailer. It must be installed on a mail hub by the system administrator. It needs existing SMTP software, which must have standard anti-spam features such as relay prevention, checking recipients during the SMTP conversation, etc. Currently you must be using Exim, though support for other mailers could be added.

You also need Tcl 8.1 or later, and a reasonably recent adns.

Software which will make SAUCE easier to install or more functional:

See also:


If you are subscribed to sauce-discuss please send bug reports there; otherwise mail them to


I have set up mailinglists sauce-announce and sauce-discuss. The announcements list is moderated and will contain only announcements of important bugs, new versions, &c. The bug reports address mentioned above is also a mailing list; feel free to subscribe to it.

There are archives and subscription web pages, or you can subscribe by sending mail containing the word `subscribe' to or


Available for download from are: You can also access the project CVS repositories: SAUCE is also from the GNU Project FTP servers and their mirrors, and as a package for Debian (in the project/experimental section).

Copyright and licensing

SAUCE is Copyright 1997-2001 Ian Jackson.

SAUCE is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program and documentation is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with SAUCE, or one should be available above; if not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA, or email

Ian Jackson /; more free software by me.

GNU home page; chiark home page; site or mirror home page

This web page is Copyright (C)1996-1999,2001 Ian Jackson. See the Copyright/acknowledgements.

Use any browser - Campaign for a non-browser-specific WWW