Re: Sending email in bulk
Most hosts will limit your sending capacities for email and they don't tell you unless you ask so you think everything worked fine and find out later only a couple of hundred went out 
I use PHP list and Dr Bytes email exporter from Zen Cart and import into PHP list, it will not duplicate addresses when importing so you'll have unique addresses only.
On the PHP forum there are instructions on how to throttle your list and send a total list but in batches of XXX per hour and that will make your host happy and accomplish a full mailing from one batch.
Ted
Never say never, it's only a matter of time, energy and asking the right person the right question!