I just had a look at the raw version of several of Dennis' posts (in
elm, pine and Apple Mail) and all the ones I examined are base64 encoded
which is pretty standard.

John Thiessen wrote on 2021.04.27 13:33:
> So we are getting somewhere ..  There was no problem in the past.
> There now is a problem; certainly for some months now.
>
> The issue may be with a setting in Dennis' Hotmail account, OR, it
> could be a setting in the email client that Dennis uses to send
> emails.
>
> Note that there are other members where from time to time their emails
> are also unreadable.
>
>
>
> On Tue, 27 Apr 2021 at 12:16, Dan N <dn92610@gmail.com> wrote:
>> something must have happened on the List server related to Dennis' email address recently...
>>
>> here are one from him long ago (April/2017) and one from another person, both using Hotmail.com
>>
>>
>>
>>