#!/bin/perl -w
use strict;

my %hash;
while (<DATA>) {
  $hash{$1}{$2}++ if ($_ =~ /.+success\s+(.+)\:(.+)/) ;
}

for my $user (keys %hash) {
  print $user."\n";
  print "==>".$_."(".$hash{$user}{$_}.")\n" for (keys %{$hash{$user}});
  print $1." total:".scalar(keys %{$hash{$user}})." Unique IP's \n\n"  if ($user =~ /(.+)\@/);
}


__DATA__
Jul 28 13:42:27 mail vpopmail[47985]: vchkpw-smtp: (PLAIN) login success joe@example.com:192.168.250.251
Jul 28 13:42:28 mail vpopmail[47992]: vchkpw-smtp: (PLAIN) login success joe@example.com:192.168.5.23
Jul 28 13:42:29 mail vpopmail[47994]: vchkpw-smtp: (PLAIN) login success sally@example.com:192.168.10.28
Jul 28 13:42:27 mail vpopmail[47985]: vchkpw-smtp: (PLAIN) login success fred@example.com:192.168.8.8
Jul 28 13:42:28 mail vpopmail[47992]: vchkpw-smtp: (PLAIN) login success joe@example.com:192.168.5.23
Jul 28 13:42:29 mail vpopmail[47994]: vchkpw-smtp: (PLAIN) login success harry@example.com:192.168.10.5