Postorius
Postorius provides a web user interface for accessing GNU Mailman. It is for people who already use GNU Mailman and want web-based access to it. Its role is limited to that access: Postorius is not a broader, standalone mailing-list product, and it does not replace GNU Mailman itself. Postorius has no known role as a replacement for a paid product, and there is no direct comparison with a commercial email-list service. People seeking an alternative to a specific paid service should not assume that Postorius provides a matching set of features. One important limitation is that the exact GNU Mailman tasks available through Postorius are unspecified. The interface's operation is also unexplained, and access to every GNU Mailman capability is not confirmed. Users should evaluate Postorius as a focused web interface, not as a substitute for GNU Mailman or a commercial mailing-list service.