Are you seeing this error in my emails?

[Alberto Salvia Novella]

Chris Pollock just said me that he's seeing the following error message 
on the top of every email he's receiving from me on this list:

 > 	Error verifying signature: parse error
 > --------------ms050806000101030505050803
 > Content-Type: text/plain; charset=utf-8; format=flowed
 > Content-Transfer-Encoding: quoted-printable
 >
 > https://goo.gl/forms/VDbXIhlFHVM6DleF3
 >
 >
 > --------------ms050806000101030505050803--
 >
 > --

Are you seeing that too?