NotOneBit’s Simple Mailing List is an open source mailing list manager designed to be both powerful and simple. Some of its most valuable properties include:

– Easy subscribe/unsubscribe integration with any web page.

– The possibility to limit messages so the host’s mail server does not overload.

– Blacklisting.

– Easy to use member management which shows you members that have signed up but not confirmed their subscription, as well as the ability to remove and import members in bulk.