I have a service I'm developing where I'd like to implement a feature where users can notify others of events/etc via email. Basically - the feature would be something along the lines of "paste your list of email recipients here" - and the service would generate a bulk-send to those specified addresses.
I'm a little wary of including such a feature though, because there's the potential for abuse with it. In a sense, it would turn my service into a bulk-mail sender...which could carry some issues along with it I'd imagine (from a legal standpoint).
Do you think my caution with such a feature is justified - and if you've ever developed such a feature - how did you address those types of issues?