NYCPHP Meetup

[Néstor]

I am looking for software to allow us to send quaterly emails to
our investor and clients(500 users).  The software should allow
the users to sign up or sign out of the list.  The direction of the
messages should just go from us to our clients.
I will be looking at majordomo and mailman but I was wondering
if you guys know of something else out there spcially in perl or PHP

Thanks,

Néstor
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