My mail server ignores it but I recently see this line in my logs:

dkim=fail reason="key not found in DNS" header.d=lists.dyne.orgheader.i=@lists.dyne.org header.a=rsa-sha256 header.s=mail header.b=myBTtKln;

And it is correct the message in question is DKIM signed. Alas in the dns records a DKIM key for dyne.org exists but not for lists.dyne.org.