Mine also does this, constantly, and annoyingly. And many messages don't
show properly in thread view because many in between are missing, so
thunderbird can't join them in a tree view, which is mostly what annoys
me. I had this email address on many lists before without an issue, but
I assumed it was only me and didn't report it.

On 07/05/2015 10:49 PM, Anto wrote:
> This is just a test message as my membership was disableddue to
> excessive bounces. I am not sure why that happened.
> _______________________________________________
> Dng mailing list
> Dng@???
> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng