#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';
use Module::CoreList;

if (Module::CoreList::is_core('Net::SMTP')) {
    say "Net::SMTP is a core module";
    say Module::CoreList->first_release('Net::SMTP');
}

__END__

$ perl test.pl
Net::SMTP is a core module
5.007003