On 20 Oct 2008, at 22:24, tedd wrote:
I have a client who wants to send out mass emails to 37,000+ opt-in members (i.e., not spam).

Any suggestions as to the best way to do this?

In my experience it's easiest to outsource this once you get past a few thousand subscribers otherwise you'll quickly discover it's not as simple as it sounds.

There are several off-the-shelf systems, some written in PHP, but I can only offer a review of the one that I've used. That was phplist but for nowhere near that number of subscribers so I have no idea how it would perform. It's definitely worth checking out: http://www.phplist.com/

I wrote up a few tips a while back which you may find useful: 
http://stut.net/blog/2008/06/18/sending-email/

One of these days I'll find time to clean up and release my home-grown solution for this, a little something I call Phostal. It's a long way off being ready for public consumption but it regularly sends emails to a subscriber base of over 800k users as well as several smaller lists, automatically handles bounces, implements several unsubscribe mechanisms and includes open tracking.

-Stut

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http://stut.net/

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