https://mail.python.org/pipermail/mailman-users/2001-January/009074.html
[Mailman-Users] RFC List Headers vs Windows Eudora
rfc listmailmanusersheadersvs
https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/S5DNTBFLIMBROUF3MYQF6KB65IDTX3XC/
[RFC nbdkit PATCH] multi-conn: New filter - Libguestfs - Libguestfs List Archives
new filterrfcpatchmulticonn