Thanks for your suggestions, and your tips Ovid - I will remember that for future use.

On the suggestion of flat files, I am currently running a duplicate of this script on another server which uses flat files, I was advised to switch to a mysql database solution so that it eased the load on the system and would speed up the script.

In what instances does mysql really become the beneficial choice if its more suitable to hold 20,000 email addresses in a flat file?

Thanks

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