I think you are on to something here. I thought if it was not installed I'd get an error but apparently not. I tried to install it anyway and expected the 'up to date' message. However, that did not happen and it really tried to install it. Unfortunately it would not install and I cannot see why. Here is my output:

Mail-Field-Received-0.24/MANIFEST
CPAN: File::Temp loaded ok (v0.20)

  CPAN.pm: Going to build A/AS/ASPIERS/Mail-Field-Received-0.24.tar.gz

Checking if your kit is complete...
Looks good
Writing Makefile for Mail::Field::Received
cp Received.pm blib/lib/Mail/Field/Received.pm
  ASPIERS/Mail-Field-Received-0.24.tar.gz
  /usr/bin/make -- OK
Running make test
/usr/bin/perl.exe "-MExtUtils::Command::MM" "-e" "test_harness(0, 'bli
+b/lib', 'b
lib/arch')" t/*.t
t/all....1/18 stringify() not implemented at /usr/lib/perl5/site_perl/
+5.10/Mail/
Field.pm line 190
        Mail::Field::stringify('Mail::Field::Received=HASH(0x101e2da0)
+') called
at t/all.t line 209
t/all.... Dubious, test returned 255 (wstat 65280, 0xff00)
 Failed 3/18 subtests
[download]

In this case it is not obvious why it is failing the tests. I can't tell what "stringify" it is trying to access but I've successfully used Mail::Field::stringify. I tried a force install but I still get the same error when I run my test script.