OT: how to set up a newsletter mailing list

.
What is the best way to set up a newsletter mailing list
so I can send the same email message once a month to all
of the email addresses (about 100) in my mailing list
without using Cc: or Bcc:? This would *not* be spam
as these are email addresses of my own clients.

Someone has suggested either Dada Mail or Google Groups,
but I have not been able to find a tutorial that explains
step-by-step the best way to set up something like this.


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