You might want to install as has some nice improvements, including wildcards to allow specifying addresses like *@foo.com, fred+*@bar.com, foo@*.bar.com etc if you have any catchall or extension addresses. Also can specify multiple resources on one call, eg -r adam@xxxxxxxxxxxxxxx -r adam@xxxxxxxxxxxx -r ABack@xxxxxxxx etc There is now also POSIX regular expression support for specifying addresses so even fancier things like (adam|test|blah)\+.*@foo.com are possible. Also there is flock(2) file locking and there is no longer need for a temporary file. Email addresses are also now case-insensitive by default (a bit of an oversight before as domains are defined case-insensitive and most mail systems seem to have case-insensitive user names also). New RPMs and tar balls are up. Windows I did not try to compile this on yet. http://www.hashcash.org/ As previously mentioned this is planned to be the last version 0 format (or last plus minor bug fixes, documentation errors). With that little todo list out of the way, we can start to think about v1 format. Adam