When I posted my message:

Date: Tue, 1 May 2018 09:53:01
To: TCLUG List <tclug-list at mn-linux.org>
Subject: Ubuntu 18.04 extra menu button

When the post was acknowledged:

Date: Sun, 6 May 2018 16:28:42
From: tclug-list-bounces at mn-linux.org

I also received some old messsages at around that time.  I think the list 
was dead from April 15 to May 6.

Anyway, I'm glad it's back.  Now that I know it is working, I'll try to 
make more use of it.

Mike