asinshesq wrote:Up until now I've ... I have been able to get away with email_package_size of 0 ... this approach is no longer ideal.
What problems are you seeing?
Alan, you know more about this than I do, but a possible performance issue with setting the queue_interval to 0 may be with the multiple processes related to the cache file (locking, unlocking, checking the lock, and reading and writing the queue data - once for each package) because each subsequent package would be processed without a delay. However, with a package size of 80, unless you have very large numbers of emails there won't be many iterations so that will probably never become a problem.