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That will require the modification of the core file register.php. Officially, because of privacy reason, you cannot registers members for a Newsletter without their consent. One way around dit would be to put it in the terms of service, so that when they register that they will agree to receive the newsletter. And then I have to modify the core file for you.
An alternative, if you insist that ALL members should get a messages, is to use the Mail to all Infusion: see http://www.phpfus...post_23072 (on Polish site where you'll need to register to obtain it).