Update : Took advice of jdporter. Kept settings in hash for convenience.

Update : Added die() flowcontrol at close() by advice of DigitalKitty

Previously one huge mailbox file (think about 3GB) was used
to store the archived e-mail. To make searching in
this easier and to make future manipulation easier I wrote a little script that writes e-mail data (dumped by
the Exim MTA into files) into a MySQL db.

#!/usr/bin/perl

use strict;
use warnings;

use DBI;
use File::Copy;

my $dbh = undef;
my $sth = undef;

my %const = (
   dbhost => 'localhost',
   dbname => 'mail',
   dblogin => 'mail',
   dbpassword => 'p4v1li0n',
   dbhandler => \$dbh,
   statementhandler => \$sth,
   statement => '',
   maildir => '/usr/db_mail/',
   currentfile => '',
   mail_datetime => '',
   mail_headers => '',
   mail_from => '',
   mail_to => '',
   mail_cc => '',
   mail_subject => '',
   mail_body => '',
);

sub dbconnect {
  $const{dbhandler} = DBI->connect("DBI:mysql:$const{dbname}:$const{db
+host}",$const{dblogin},$const{dbpassword});
}

sub dbdisconnect {
  if($const{dbhandler}) {
    $const{statementhandler}->finish() if $sth;
    $const{dbhandler}->disconnect();
  }
}

sub insert {
  $const{mail_body} = substr $const{mail_body}, 0, 1000000; #eerste MB
  $const{statement} = qq[INSERT INTO archive VALUES(?,?,?,?,?,?,?,?)];
  dbconnect();
  $const{statementhandler} = $const{dbhandler}->prepare($const{stateme
+nt});
  $const{statementhandler}->execute(undef,$const{mail_datetime},$const
+{mail_from},$const{mail_to},$const{mail_cc},$const{mail_subject},$con
+st{mail_headers},$const{mail_body});
  dbdisconnect();
}

sub parse {
  open(FILE, $_[0]) or return;
 # print "$_[0]\n";
  my $mail = join('', <FILE>) if (-f $_[0]) && ($_[0] =~ /^$const{mail
+dir}/);
  close(FILE);
  return if !$mail;
  local $/=undef;
  ($const{mail_datetime}) = $mail =~ m/Delivery-date: (.*?)\n/s;
  ($const{mail_from}) = $mail =~ m/From: (.*?)\n/s;
  ($const{mail_to}) = $mail =~ m/To: (.*?)\n/s;
  ($const{mail_cc}) = $mail =~ m/Cc: (.*?)\n/s;
  ($const{mail_subject}) = $mail =~ m/Subject: (.*?)\n/s;
  ($const{mail_headers}) = $mail =~ m/^(.*?)\n\n/s;
  ($const{mail_body}) = $mail =~ m/\n\n(.*?)$/s;
 
  insert();
  unlink $_[0] if move($_[0],"$const{maildir}parsed/$const{currentfile
+}") == 1;
}

opendir(MAILDIR, $const{maildir}) or exit 10; #Can't open maildir
foreach my $thisfile (readdir(MAILDIR)) {
  $const{currentfile} = $thisfile;
  parse("$const{maildir}$thisfile");
}
closedir(MAILDIR);




exit 0;
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