mailbody should contain the data, recieved headers and all.

use Net::SMTP; 
# Yes, this is cribbed straight from node 'How 
# do I send e-mail from my Perl Program?'

# You need to fill in the variables.
# Read the perldoc for more info on using SMTP.

my $smtp = Net::SMTP->new("$mailserver") or die $!;
$smtp->mail( $forward_from );
$smtp->to( $forward_to );
$smtp->data();
$smtp->datasend($mailbody);
$smtp->dataend();
$smtp->quit();
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References: Answer: How do I send e-mail from my Perl Program? by Adam