I am having problems trying to get the above service working.

I can't remember which version of iRedMail I have but it's basically bringing up the following error:

amavisd
fetch_modules: error loading required module Compress/Zlib.pm:
  dualvar is only available with the XS version of Scalar::Util at /usr/lib/perl5/site_perl/5.8.8/Compress/Zlib.pm line 8
  BEGIN failed--compilation aborted at /usr/lib/perl5/site_perl/5.8.8/Compress/Zlib.pm line 8.
  Compilation failed in require at /usr/sbin/amavisd line 197.
ERROR: MISSING REQUIRED BASIC MODULES:
  Compress::Zlib
BEGIN failed--compilation aborted at /usr/sbin/amavisd line 237.

Any suggestions on getting this working?

I mean I have tried using CPAN to install the: ' Compress::Zlib' module using install then the module name in the MCPAN shell but it brings up this error here:

Failed Test Stat Wstat Total Fail Failed List of Failed
-------------------------------------------------------------------------------
t/000prereq.t 2 512 30 2 6.67% 3 30
t/01misc.t 1 256 132 1 0.76% 3
t/cz-01version.t 255 65280 2 3 150.00% 1-2
t/cz-03zlib-v1.t 255 65280 456 907 198.90% 1 4-456
t/cz-05examples.t 255 65280 ?? ?? % ??
t/cz-06gzsetp.t 255 65280 ?? ?? % ??
t/cz-08encoding.t 255 65280 29 57 196.55% 1-29
t/cz-14gzopen.t 255 65280 255 507 198.82% 1 3-255
3 tests and 29 subtests skipped.
Failed 8/85 test scripts, 90.59% okay. 742/70093 subtests failed, 98.94% okay.
make: *** [test_dynamic] Error 255
/usr/bin/make test -- NOT OK
Running make install
make test had returned bad status, won't install without force

I have tried installing the module concerned in perl, which is: Compress::Zlib

I am pretty desperate now, any helps appreciated,
Jeremy.