a SASL object this should work:

 #------usage example--------------
 use Authen::SASL 2.10;
 use Net::POP3;

 my $sasl = Authen::SASL->new( mechanism => 'GSSAPI' );
 $pop = Net::POP3->new('pop3host');
 $pop->auth($sasl);

 my $msgnums = $pop->list; # hashref of msgnum => size
 foreach my $msgnum (keys %$msgnums) {
     my $msg = $pop->get($msgnum);
     print @$msg;
 }
 $pop->quit;
#------end of usage example--------------

Dennis, please try and let us know if this works!

Achim