+1 for MailChimp. It would have the advantage of giving you stats on how many people opened the mail, and allows people to unsubscribe, subscribe etc.
However, for such a small mailing list, it's als viable (I would think) to send this out from your own email client. Some clients (like Thunderbird) make it easy to send HTML email. All the same, given that MailChimp is free and offers lots of extras, that's probably how I'd do it.
As Ted said, all your CSS has to be inline to be half-way reliable, and you need to use tables for layout, too.

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