Here is one that sends an image, you can alter it to send text attachments. For real attachments, you need to setup boundary layers, and a Content-type: multipart/mixed; boundary=\"=........

Don't ask me to explain this..... I tested it once and it worked.... but I use MIME::Lite. :-)

#!/usr/bin/perl
use warnings;
use strict;

# works but..................
# needs some taint checking if used with CGI
# You would be wise to consider what happens if you try:
# http://www.you.com/cgi-bin/sendattach.pl?`myonewordcommandwithoutarg
+s`
# and consider if you really want to give the whole world access to 
# execute arbitrary commands on your server.

# Put the name of your file here
my $filename = shift || $0 ;

# Location of sendmail program on your host
my $mailprog = '/usr/sbin/sendmail';

# The email where you want the attachment to be sent to.
my $to = 'zentara@zentara.zentara.net';

# Who the message is from
my $from = 'zentara@zentara.zentara.net';

# Subject of the email.
my $subject = "Attachment!";

# Type your message here.
my $message = "This is an attachment.";

# Confirmation message that the email has been sent.
my $confirm_message = "The email and attachment has been sent!";

my $boundary = 'qwertry'.time;

######################################################
# Encode according to file extention.

my $content_type = "text/plain; charset=\"us-ascii\";"; #default

my $encoding;

if ( $filename =~ /\.gif$/i ){ $content_type =
"image/gif; name=\"$filename\"; $encoding = 'base64';"}

if ( $filename =~ /\.jpg$/i ){ $content_type =
"image/jpeg; name=\"$filename\"; $encoding = 'base64';"}

if ( $filename =~ /\.zip$/i ){ $content_type =
"application/zip; name=\"$filename\"; $encoding = 'base64';"}

if ( $filename =~ /\.html$/i || $filename =~ /\.htm$/i ){ 
              $content_type = "text/html; charset=\"us-ascii\";";}
          
if ( $filename =~ /\.xls$/i ){ 
              $content_type = "application/msexcel; charset=\"us-ascii
+\";";}


if (   $filename =~ /\.txt$/i
    || $filename =~ /\.dat$/i
    || $filename =~ /\.doc$/i
    || $filename =~ /\.pl$/i
    || $filename =~ /\.cgi$/i ){ $content_type =
  "text/plain; charset=\"us-ascii\";";}

#############################################
# Get the attachment
my $b64image;
my @file;

if($encoding){ 
    open( IMAGE, "$filename");
    binmode(IMAGE);
    undef $/;
    my $rawimage = <IMAGE>;
    $/        = "\n";
   close IMAGE;

$b64image = &encode_base64($rawimage);
chomp $b64image;
    }else{    # Doesn't need encoding. (Plain text type of document)
      open( FILE, $filename );
      @file = <FILE>;
      close(FILE);
}
#############################################
# Send Email

open( MAIL, "| $mailprog $to" )
  || die("$0:  Fatal Error!  Cannot open sendmail:: $!\n");
print MAIL "Reply-to: $from\n";
print MAIL "From: $from\n";
print MAIL "To: $to\n";
print MAIL "Subject: $subject\n";
print MAIL "Mime-Version: 1.0\n";
print MAIL
"Content-type: multipart/mixed; boundary=\"======================_$bou
+ndary==_\"\n";

print MAIL"--======================_$boundary==_
Content-Type: text/plain; charset=us-ascii";
print MAIL "\n\n";

print MAIL "$message\n\n";

print MAIL "--======================_$boundary==_
Content-Type: $content_type\n";

if($encoding){ print MAIL "Content-Transfer-Encoding: $encoding\n";
    print MAIL "Content-Disposition: inline; filename=\"$filename\"\n\
+n";
    print MAIL $b64image;
  }else{ print MAIL "Content-Disposition: inline; filename=\"$filename
+\"\n\n";
      foreach my $line (@file) {
           print MAIL "$line";
    }
}
print MAIL "\n\n\n";
print MAIL "--======================_$boundary==_--";

close(MAIL);

#######################################
# Confirm Mail has been sent
print "Content-type: text/html\n\n";
print " $confirm_message\n\n";

#######################################
sub encode_base64  
{
    my $s = shift ;
    my $r = '';
    while( $s =~ /(.{1,45})/gs ){
        chop( $r .= substr(pack("u",$1),1) );
    }
    my $pad=(3-length($s)%3)%3;
    $r =~ tr|` -_|AA-Za-z0-9+/|;
    $r=~s/.{$pad}$/"="x$pad/e if $pad;
    $r=~s/(.{1,72})/$1\n/g;
    $r;
}
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