Use a service like MailChimp.com for your newsletters, but be careful - they will ban you if a lot of users flag you as spam.
One thing you can do to avoid being flagged is make sure the people actually want your newsletter - they signed up to your service at least semi-recently.
I'd also recommend subscribing to a dedicated mail service. There are dozens of variables that affect your mail delivery. You should read the postmark blog (http://blog.postmarkapp.com/) for a peek into those.
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[ 3.8 ms ] story [ 14.9 ms ] threadOne thing you can do to avoid being flagged is make sure the people actually want your newsletter - they signed up to your service at least semi-recently.