What is the best way to send out email newsletters? I'm hoping for a 'free' way (php, etc)?

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http://www.phplist.com/
What is the best way to send out email newsletters? I'm hoping for a 'free' way (php, etc)?
Sign people up to subscription lists like Yahoo Groups or listservs, that gives them a legitimate method of opting out.
Reply:We did ours by building a document (Word or PDF or ... whatever) and maintaining a membership list in our Outlook Contacts (you could do it in your Google contacts or your Yahoo! contacts or Outlook Express to keep it segregated from your personal contacts...) then doing a "mass emailing" with the file attached.