Replace dkim-filter in mail filtering section with opendkim

Committed a fix to revision 511 in the Maverick branch. I'll work on getting patches into the Lucid branch as well.

Thanks Scott for reporting this bug.

Committed fix to revision 509 to Lucid branch.

This bug was fixed in the package ubuntu-docs - 10.10.1

---------------
ubuntu-docs (10.10.1) maverick; urgency=low

  * First release for maverick
  * General:
    - Update copyright year, LP: #580396
    - Update version numbers for maverick, LP: #587119
    - Update pot files
  * Administrative:
    - Users and Groups app UI changed - adjusted directions,
      LP: #570429 (Connor Imes)
  * Basic-commands:
    - Removed incorrect comment about using ~ with sudo,
      LP: #570423 (Connor Imes)
  * Internet:
    - Add section on Ubuntu One, authored by Matt Griffin with
      some changes/review
    - Typos: Cicso -> Cisco. Alex Wardle, LP: #561084
  * Musicvideophotos:
    - Add material on using Ubuntu One Music Store and
      other Music Stores
      within Rhythmbox, content submitted by Matt Griffin
    - Update microphone troubleshooting, LP: #591164
  * Serverguide:
    - Removed erroneous text from vmbuilder command,
      LP: #559190
    - Typo in network-config section. Alex Wardle, LP: #550892
    - Fix typo in Kerberos section. David C. Curtis, LP: #561788
    - Replaced dkim-filter with opendkim, feedback from
      Scott Kitterman. LP: #561825
    - Changed ldapsearch command in ACL section for new authentication
      mechanism. LP: #333733
    - Adjusted certificate wording to be more concise about which
      lines to copy. LP: #575859
    - Changed samba restart command to use new upstart scripts.
      LP: #575540
    - New information about granting groups Admin rights for Samba.
      LP: #579851
    - Various typos and English fixes from Travis Nichol, Connor Imes,
      Vikram Dhillon, Dean Sas, Andrew Rowell. LP: #594913,
      LP: #572959, LP: #603947
    - New Amavisd-new and Spamassassin section which adds note about possible
      large amount of error messages sent to email. LP: #165184 (Adam Sommer)
    - Removed OpenNebula section (Adam Sommer)
    - Removed eBox section (Adam Sommer)
    - Reviewed and updated User Management and Console Security sections
      (Adam Sommer)
    - Fixed spelling typo of dyngroup.schema, fixed ldapscripts <ask> example
      explanation, and ldapscripts example template path. LP: #595001
      (Adam Sommer)
    - Updates to UEC sections (Adam Sommer)
    - New "First Boot" section covering clout-init functionality (Adam Sommer)
    - Fix broken links to installation-guide, add distro-rev-short
      entity, LP: #575961
  * Windows:
    - Change wording of windows/C/preparing.xml, LP: #483153
 -- Matthew East <email address hidden> Sat, 14 Aug 2010 22:35:52 +0100