newsletter manager for ssmtp?

[Squinky86]

I was just asked to upkeep a newsletter for a local club at school and was wondering what (newsletter/mailing list) manager works best with ssmtp (I don't want a daemon running, plus my ISP just blocked home-served sendmail-like programs from sending mail directly). I need to be able to:

1. send around 200 emails at a time
   
2. have it so no one knows who else is on the list or subscribed to the newsletter
   
3. ability to digitally sign newsletter (preferably through evolution)
   

ezmlm required me to install postfix, and I'd prefer to not make it a full-blown mailing list, just an easy way to send mail to everyone at once.
Thanks!
-Squinky
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[Squinky86]

Got to thinking some more, and figured that there's a better way of going about this:
Is there a way to spoof the to: field in an email so that the hundreds of people who receive it don't see the others that the message was sent to?
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Me