I believe you. Clinging to the hope that some of my code is good I tried this using some of your suggestions:

#!/usr/bin/perl -w

#checks for valid email address
#usage validemail <file containing email addresses>

use warnings;
use strict;
use Email::Valid::Loose;
use Net::DNS;
use Parallel::ForkManager;
use Fcntl qw/:flock :seek/;

my $pm=new Parallel::ForkManager(20);
my $resolver=Net::DNS::Resolver->new();
my $addrfile = $ARGV[0];
my ($is_valid, $host, $x, @mx, $add, @adds, $handle);

#custom words that make emails invalid to you
my @custom = qw(
 postmaster
 webmaster
);
  

open (EMAILS, "$addrfile");

 while (<EMAILS>){
 $_ =~ s/\015//;
 chomp $_;
    push @adds, $_;
}
close (EMAILS);

#warning, I will delete existing files
open (BADADDR, ">badmails") || die;
open (GOODADDR, ">goodmails") || die;

foreach $add (@adds){ 
    
    $pm->start and next;

    foreach $x (@custom){
            if ($add =~ m/$x/){
                writebad(); #address is bad
                $pm->finish;
            }
        }

        #if email is invalid move on
        if (!defined(Email::Valid::Loose->address($add))){
            writebad(); #address is bad
            $pm->finish;
        }

        #if email is valid get domain name 
        $is_valid = Email::Valid::Loose->address($add);
        if ($is_valid =~ m/\@(.*)$/) {
            $host = $1;
        }
        $is_valid="";
        
        # perform dsn lookup to check domain
        @mx=mx($resolver, $host);

        if (@mx) {
            writegood(); #address is good
            }else{
            writebad(); #address is bad
        }
       
    $pm->finish;
}

close (GOODADDR);
close (BADADDR);

1 until wait () == -1;  # Wait till all children have died.
exit;

sub writegood{
    flock GOODADDR, LOCK_EX or die "Flock failed: $!\n";
    seek GOODADDR, SEEK_END, 0 or die "Seek failed: $!\n";
    print GOODADDR "$add\n";
    flock GOODADDR, LOCK_UN or die "unFlock failed: $!\n";
}

sub writebad{
    flock BADADDR, LOCK_EX or die "Flock failed: $!\n";
    seek BADADDR, SEEK_END, 0 or die "Seek failed: $!\n";
    print BADADDR "$add\n";
    flock BADADDR, LOCK_UN or die "unFlock failed: $!\n";
}
[download]

Alas, now only a couple of blank lines are written to goodmails and badmails. Fork Me!

Neil Watson
watson-wilson.ca

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