Hi, I sent an email to the [email protected] 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 [email protected]. 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