I have to agree with pangea33. This is not the place to do mass-marketing using email lists like PHPlist. Here's why:
A. You're limited 200 emails per hour over any venue.
B. A list of 700 people will take three plus hours to send at 200 per hour.
C. If your list is well documented and you have proof that everyone on it has subscribed themselves, Dreamhost will sometimes allow you to bump it to 500 per hour, if you're lucky. But you have to have irrefutable proof, such as subscription history logs.
D. Suppose you're sending something at 200 emails per hour. You send the first 200 at 1:00pm. Now you want to send an email to Mom from your Outlook? You have to wait an hour.
If you are accused of sending spam and can't prove that the accuser subscribed himself, you're likely going to get in trouble with Dreamhost.
I've got a non-profit list that I send out on PHPList. There are 700 people on the list. I have PHPList set to send out from a browser to 10 email addresses at a time every 240 seconds, giving me a rate of 150 emails per hour. That way I can still send out an occasional email to my friends, but at this rate, my browser will busy for four and two-thirds hours, so long as I don't close the browser.
It may be slow, but it's cheap - something non-profits like. It used to take longer to fax a press release over a modem when people still did that, so 'slow and cheap' is nothing new to non-profits.
This may be entirely inappropriate for mass marketing, though.