Thanks for your reply re. TLS On Fri, 15 Apr 2016, Patrick Laimbock wrote: > It's unclear what you mean. I saw a new message on the ML and responded to > it. Where did this 'threading breaking' take place? My mistake; apologies to to other list members. I had replied to an existing message, to grab the list address with a minimum number of keystrokes. I had forgotten that my mailer would automatically include the Message-ID header in hidden In-Reply-To: and References: mail headers. Mailman (used by the CentOS list archives) creates message threads first by In-Reply-To and then by Subject headers. This caused my message to be grouped with the existing messages about "mount bind problem" in https://lists.centos.org/pipermail/centos/2016-April/thread.html (per e.g. https://www.mail-archive.com/mailman-users@python.org/msg62609.html) The mail client Thunderbird appears to use a different algorithm; in that, I see your message (this one I'm replying to) in the original "mount bind" thread, while in the archive I see it in a separate thread. Andrew