[Mimedefang] SURBL lookups no longer happening after upgrade to 2.48

[Rob MacGregor]

Ok, putting the test into local.cf got me the following error:

... mimedefang-multiplexor[50777]: Slave 0 stderr: Failed to run
URIBL_SC_SURBL SpamAssassin test, skipping:        (Can't locate
object method "check_uridnsbl" via package
"Mail::SpamAssassin::PerMsgStatus" at
/usr/local/lib/perl5/site_perl/5.8.5/Mail/SpamAssassin/PerMsgStatus.pm
line 2296. )

Which is what happens if the module isn't loaded, so it looks like
something isn't happening with init.pre when called from MD.

Sticking the loadplugin command into local.cf AND importing all the
UIRBL lines makes it work, but there's obviously something broken :(

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Rob MacGregor
      Whoever fights monsters should see to it that in the process he 
        doesn't become a monster.                  Friedrich Nietzsche