# sa-update -D
[26491] dbg: logger: adding facilities: all
[26491] dbg: logger: logging level is DBG
[26491] dbg: generic: SpamAssassin version 3.2.5
[26491] dbg: config: score set 0 chosen.
[26491] dbg: dns: no ipv6
[26491] dbg: dns: is Net::DNS::Resolver available? yes
[26491] dbg: dns: Net::DNS version: 0.65
[26491] dbg: generic: sa-update version svn607589
[26491] dbg: generic: using update directory: /var/lib/spamassassin/3.002005
[26491] dbg: diag: perl platform: 5.010000 linux
[26491] dbg: diag: module installed: Digest::SHA1, version 2.12
[26491] dbg: diag: module installed: HTML::Parser, version 3.61
[26491] dbg: diag: module installed: Net::DNS, version 0.65
[26491] dbg: diag: module installed: MIME::Base64, version 3.07_01
[26491] dbg: diag: module installed: DB_File, version 1.816_1
[26491] dbg: diag: module installed: Net::SMTP, version 2.31
[26491] dbg: diag: module installed: Mail::SPF, version v2.005
[26491] dbg: diag: module installed: Mail::SPF::Query, version 1.999001
[26491] dbg: diag: module installed: IP::Country::Fast, version 2
[26491] dbg: diag: module installed: Razor2::Client::Agent, version 2.84
[26491] dbg: diag: module installed: Net::Ident, version 1.20
[26491] dbg: diag: module installed: IO::Socket::INET6, version 2.54
[26491] dbg: diag: module installed: IO::Socket::SSL, version 1.27
[26491] dbg: diag: module installed: Compress::Zlib, version 2.015
[26491] dbg: diag: module installed: Time::HiRes, version 1.9711
[26491] dbg: diag: module not installed: Mail::DomainKeys ('require' failed)
[26491] dbg: diag: module installed: Mail::DKIM, version 0.36
[26491] dbg: diag: module installed: DBI, version 1.609
[26491] dbg: diag: module installed: Getopt::Long, version 2.37
[26491] dbg: diag: module installed: LWP::UserAgent, version 5.829
[26491] dbg: diag: module installed: HTTP::Date, version 5.810
[26491] dbg: diag: module installed: Archive::Tar, version 1.38
[26491] dbg: diag: module installed: IO::Zlib, version 1.07
[26491] dbg: diag: module not installed: Encode::Detect ('require' failed)
[26491] dbg: gpg: Searching for 'gpg'
[26491] dbg: util: current PATH is: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/php/bin
[26491] dbg: util: executable for gpg was found at /usr/bin/gpg
[26491] dbg: gpg: found /usr/bin/gpg
[26491] dbg: gpg: release trusted key id list: 5E541DC959CB8BAC7C78DFDC4056A61A5244EC45 26C900A46DD40CD5AD24F6D7DEE01987265FA05B 0C2B1D7175B852C64B3CDC716C55397824F434CE
[26491] dbg: channel: attempting channel updates.spamassassin.org
[26491] dbg: channel: update directory /var/lib/spamassassin/3.002005/updates_spamassassin_org
[26491] dbg: channel: channel cf file /var/lib/spamassassin/3.002005/updates_spamassassin_org.cf
[26491] dbg: channel: channel pre file /var/lib/spamassassin/3.002005/updates_spamassassin_org.pre
[26491] dbg: channel: metadata version = 795855
[26491] dbg: dns: 5.2.3.updates.spamassassin.org => 795855, parsed as 795855
[26491] dbg: channel: current version is 795855, new version is 795855, skipping channel
[26491] dbg: diag: updates complete, exiting with code 1

# perl -MCPAN -e "install Mail::DomainKeys"
Sorry, we have to rerun the configuration dialog for CPAN.pm due to
some missing parameters...



The following questions are intended to help you with the
configuration. The CPAN module needs a directory of its own to cache
important index files and maybe keep a temporary mirror of CPAN files.
This may be a site-wide or a personal directory.

I see you already have a  directory
    /root/.cpan
Shall we use it as the general CPAN build and cache directory?

<cpan_home>
..............AND FOLLOW THE INSTRUCTIONS...................

# sa-update -D 2>&1 | grep Domain
[28287] dbg: diag: module installed: Mail::DomainKeys, version 1.0