There used to be a SmartList (a procmail based mailing list manager) web gateway available on spack.org. Given that almost no one uses SmartList anymore and that I haven't run it in years, I've finally pulled it off-line.
If still have a need for it you are welcome to download the source and install it locally on your own machine.
If it's been useful to you in the past or is useful to you in the future I'd love it if you'd drop a note here. Other then people hitting the web logs for all these years I've never really heard of anyone actually using it and thinking that it's useful. -- AdamShand