Using <cpan://Net::SMTP> will work fine. It is the nature of internet e-mail that you set the from and to twice if you do raw SMTP; once in the e-mail header and once in the SMTP session. There's a good O'Reilly book Programming Internet Email that goes into all the nasty details of this stuff.

Here's an example from a piece of my code. In this case I uses MIME::Lite to do the actual encoding, but the process should be the same with MIME::Entity. I've removes the error checking in the Net::SMTP communication to make the code smaller and easier to post; you should add the error checking back if you plan to use Net::SMTP. One other note is that MIME::Lite has its own send method that will send the message. So unless you need (or want) to do the SMTP negotiation yourself, MIME::Lite may be an easier solution for you as it can encode, add attachments and send the message.

use Net::SMTP;
use MIME::Lite;

my $from='foo@testdomain.com';
my $to='bar@testdomain.com'

my $msg_html_rich = new MIME::Lite(
   From    => $from,
   Subject => 'MIME::Lite Test',
   To      => $to,
   Type    => 'multipart/alternative');
attach $msg_html_rich
   Type     =>'text/plain',
   Data     =>'message in plain text';
attach $msg_html_rich
   Type     =>'text/html',
   Data     =>'message in <b>HTML</b> with <i>many</i> markup tags';

my $smtp= Net::SMTP->new('127.0.0.1',
                Timeout => 180);
$smtp->mail($from);
$smtp->to($to);
$smtp->data();
$smtp->datasend($msg_html_rich->as_string);
$smtp->dataend();
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