use strict;
use warnings;
use LWP::UserAgent;
use HTTP::Request;

# get email from STDIN
my $email = do { local $/; <STDIN> };

# do the parsing of EMAIL here...
# ...

# build variables to pass to PHP via post
# var1, var2 are CGI variables
my %vars = (
    var1 => $var1,
    var2 => $var2,
    # ...
);

# send the POST to php
my $url = "http://server/cgi-bin/script.php";
my $us = new HTTP::Request;
my $res = $us->post($url, \%vars);