SPF
Ubuntu 8.04
apt-get install libmail-spf-query-perl:
Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: libnet-cidr-lite-perl libnet-dns-perl libnet-ip-perl libsys-hostname-long-perl The following NEW packages will be installed: libmail-spf-query-perl libnet-cidr-lite-perl libnet-dns-perl libnet-ip-perl libsys-hostname-long-perl 0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded. Need to get 388kB of archives. After this operation, 1430kB of additional disk space will be used. Do you want to continue [Y/n]? Y Get:1 http://us.archive.ubuntu.com hardy/universe libsys-hostname-long-perl 1.4-1 [11.1kB] Get:2 http://us.archive.ubuntu.com hardy/universe libnet-ip-perl 1.25-2 [30.3kB] Get:3 http://us.archive.ubuntu.com hardy/universe libnet-dns-perl 0.63-1 [261kB] Get:4 http://us.archive.ubuntu.com hardy/universe libnet-cidr-lite-perl 0.20-1 [13.6kB] Get:5 http://us.archive.ubuntu.com hardy/universe libmail-spf-query-perl 1:1.999.1-3 [71.7kB] Fetched 388kB in 16s (23.7kB/s) Selecting previously deselected package libsys-hostname-long-perl. (Reading database ... 46646 files and directories currently installed.) Unpacking libsys-hostname-long-perl (from .../libsys-hostname-long-perl_1.4-1_all.deb) ... Selecting previously deselected package libnet-ip-perl. Unpacking libnet-ip-perl (from .../libnet-ip-perl_1.25-2_all.deb) ... Selecting previously deselected package libnet-dns-perl. Unpacking libnet-dns-perl (from .../libnet-dns-perl_0.63-1_amd64.deb) ... Selecting previously deselected package libnet-cidr-lite-perl. Unpacking libnet-cidr-lite-perl (from .../libnet-cidr-lite-perl_0.20-1_all.deb) ... Selecting previously deselected package libmail-spf-query-perl. Unpacking libmail-spf-query-perl (from .../libmail-spf-query-perl_1%3a1.999.1-3_all.deb) ... Setting up libsys-hostname-long-perl (1.4-1) ... Setting up libnet-ip-perl (1.25-2) ... Setting up libnet-dns-perl (0.63-1) ... Setting up libnet-cidr-lite-perl (0.20-1) ... Setting up libmail-spf-query-perl (1:1.999.1-3) ...
References
http://wiki.zimbra.com/index.php?title=Improving_Anti-spam_system#SPF
https://www.zimbra.com/forums/installation/10480-spf-question.html