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define('PHPBB_ACM_MEMCACHED_PORT', 0); define('PHPBB_ACM_MEMCACHED_HOST', '/path/to/socket');
The default is 20. If you set it to 0, it does not use a queue and attempts to send out all emails immediately. Unless your mail server can handle large amounts of email at once, you should set a package size to keep it from being overwhelmed.