Couple more points apart from those already mentioned:

1. Where you have

    if ($opts{h} || $opts{u})  { exec "perldoc $0" };
   

   you might want to check out the Pod::Usage module. For example (copied straight from the docs)

    use Pod::Usage;
    use Getopt::Long;
    ## Parse options
    GetOptions("help", "man", "flag1") || pod2usage(-verbose => 0);
    pod2usage(-verbose => 1)  if ($opt_help);
    pod2usage(-verbose => 2)  if ($opt_man);
    pod2usage(-verbose => 2, -message => "$0: $error_msg.\n")
        if $some_error
   

   The neat thing about this module, is that it can handle your 'usage' message (runrig), or display a full man page without you having to do it your self, or setting off an exec to do it for you.

2. You having the following

    if ($opts{f})             { $conf = $opts{f} };        
    # if no conf file specified, use "/etc/errreporter.conf as
    # the default ...
    unless ($conf) { $conf = "/etc/errreporter.conf" 
   

   Simpler (or at least more idiomatic) may be

    $conf = $opts{f} if exists $opts{f};
    $conf ||= "/etc/errreporter.conf";
   

   or even

    $conf = $opts{f} || "/etc/errreporter.conf";
   

   Mind out for the gotcha though... $conf will get set to the default if $opts{f} doesn't exist, isn't defined, or if it is just logically false (0 or empty string)

3. You might want to load your config file using require. Its a lot safer, more robust, more portable and just plain easier

4. You seem to be fond of using regexps for testing string equality:

    if ($identifier =~ /$_/)...
    if ($ignore =~ /yes/)...
   

   What's wrong with plain old

    if ($ignore eq 'yes')...
   

   That's what 'eq' is for

Good luck with it :)

Update corrected $ignore eq /yes/ to $ignore eq 'yes'. Thanks chipmunk for pointing that out... it was a typo... honest!