Hi,

I sent an email to the discuss@mpich.org address and because I wasn't a member it
sent back:
You are not allowed to post to this mailing list because your email
address is not subscribed.  Therefore, your message has been
automatically rejected.  If you wish to subscribe to this list, please
do so at:

https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss

If you think that your messages are being rejected in error, please
check that you are using the correct email address when sending
messages, then contact the mailing list owner at
mpich-discuss-owner@mcs.anl.gov.
The thing is, that mailman site does not have mpich-discuss. It should probably
redirect to:
https://lists.mpich.org/mailman/listinfo/mpich-discuss
or something like it, instead.

John