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					Originally Posted by JoeD  Agreed.
 For a client list to be realistic, every single line must be a unique email address. There will be repeated domains in the list where you're keeping a note of every employee/contact at a given client's company, but the names themselves are then going to vary.
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 If I had to guess, without any more info to go on, I'd bet a "client list"  of 540000 entries will have a huge number of comcast.net, hotmail.com, and gmail.com type domains all through it.
There is a relatively small set of companies who would have anywhere close to 500,000 distinct domains in their 'client' list...not counting mass mailers.