use strict;
use Net::SMTP;
use MIME::Base64;
 
my $smtphost = 'some_smtp_host';
my $username = 'username';
my $password = 'password';
my $emailto = 'to@hello.com';
my $emailfrom = 'from@hello.com';
my $subject = 'Hello world';
my $message = 'Test message';

my $smtp = Net::SMTP->new($smtphost, Debug => 1, Timeout => 5);

$smtp->datasend("AUTH LOGIN\n");
$smtp->datasend(encode_base64($username));
$smtp->datasend(encode_base64($password));

$smtp->mail($emailfrom);
$smtp->to($emailto);

$smtp->data();

my $boundary = 'frontier';
my $attachBinaryFile = '18560243.pdf';
$smtp->datasend("MIME-Version: 1.0\n");
$smtp->datasend("Content-type: multipart/mixed;\n\tboundary=\"$boundary\"\n");
$smtp->datasend("--$boundary\n");
$smtp->datasend("Content-type: text/plain;\n");
$smtp->datasend("\nSome plain text here in the body of the email\n");
$smtp->datasend("\n");
$smtp->datasend("--$boundary\n");
$smtp->datasend("Content-Type: appliaction/pdf; name=\"$attachBinaryFile\"\n");
$smtp->datasend("Content-Transfer-Encoding: base64\n");
$smtp->datasend("Content-Disposition: attachment; filename=\"$attachBinaryFile\"\n");
$smtp->datasend("\n");
my $buf;
open(DAT, "/path/18560243.pdf") || die("Could not open binary file!");
   binmode(DAT);
   local $/=undef;
   while (read(DAT, my $picture, 4096)) {
      $buf = &encode_base64( $picture );
      $smtp->datasend($buf);
   }
close(DAT);
$smtp->datasend("\n");
$smtp->datasend("--$boundary\n");
$smtp->dataend();
$smtp->quit;

sub date_r {
    my ($monthday, $mon, $yr, $ time, $hour, $str);
    my (@lt) = ();

    @lt = localtime();
    $monthday = $lt[3];
    $mon = $lt[4]+1;
    $yr = $lt[5] + 1900;
    $hour = $lt[2];
    $time = sprintf("%02d:%02d:%02d", $hour, $lt[1], $lt[0]);
    $str = $mon . '/' .$monthday . '/' . $yr . ' ' . $time;
    return $str;
}