Ah, now found it.
I believe that link should be in the body of the email not hidden in the headers.
Jim
> On 18 Nov 2021, at 12:50, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> James Pitchford <jim.pitchford@ithought.biz> writes:
>> Please can someone advise how to remove myself from this email list.
>
> See the List-Unsubscribe link, in the headers of every email you
> receive from the list.
>
> regards, tom lane