[ice9]

First, try the script, and confirm that it's failing. Then, look in your apache error log (probably /var/log/httpd/error_log). If it's failing because of a PHP memory error, you'll probably see a line like this:

Allowed memory size of 50331648 bytes exhausted (tried to allocate 0 bytes)

If you see a line like that, double the memory_limit variable, restart apache, then try again. Watch your server load while the script is running, via the "top" command. Also, you might need to limit it to send only 100 PMs at a time, rather than the default 300. You can also adjust this while the script is executing, by altering the value in the meta-refresh url.

When you're done, don't forget to change memory_limit back in php.ini, and then restart apache again.