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For those interested and for list archives, I'm sharing with you the reasons
of those .tt2 error messages and a solution on how to avoid them.

In my case, those error messages were due a badly behaved web spider or email
collector.  This bot was going through all of my Sympa robots trying to index
them or steal email addresses.  But it is badly behaving and doesn't do proper
HTTP1.1 requests: it doesn't send the hostname he tries to contact.  This
makes it impossible for apache to know which virtual host to use to serve the
request, apache is then defaulting to the first one its configuration.
Sending along the request to Sympa that cannot find the requested list or
email archived in the queried Sympa robot.  Hence the error messages.

This badly behaved bot is named Purebot/1.1 from http://www.puritysearch.net/

If you want to avoid any similar issue, the best is probably to forbid any
entry to your lists to this bot.  This can be done in apache configuration
files or in a .htaccess file containing the following directives:

        RewriteEngine On
        RewriteCond %{HTTP_USER_AGENT} .*Purebot.*
        RewriteRule ^/wws/.*\.html$ /wws/ [G]

Hope this helps!

Antoine.