Daily message via anonymous subscription.

We would like to send a daily "newsletter" that contains information about the animal of the day. We currently do not have users registering to be part of the community, rather we use Anonymous Subscription via our main web site. I am wondering if any other BBNC users do something like this. The newsletter would show a different animal each day or week, via a link to a URL on our main web site. I am trying to figure out the most efficient way to acheive getting this info out to those showing an interest.