root@development:~# /opt/bin/perl5.8.2 -MData::Dumper=Dumper -MNet::SMTP -le '$smtp = Net::SMTP->new("localhost"); print $! unless defined $smtp'
Invalid argument

root@development:~# /usr/bin/perl5.6.1 -MData::Dumper=Dumper -MNet::SMTP -le '$smtp = Net::SMTP->new("localhost"); print $! unless defined $smtp'