Thunderbird: how can I set permanent custom headers?

[Ottavio Caruso <ottavio2006-usenet2012@yahoo.com>]

Hi,

For the lack of a dedicated Thunderbird mailing list, I am forced to ask 
here.

I am using Debian Buster. I have set up a custom header (X-no-archive)
using this guide:
https://www.lifewire.com/arbitrary-custom-heading-email-thunderbird-1173089

It works fine, but I have to click on the double arrows (top right) all 
the time and then type "Yes"

Is there a way to have this header with a default value "Yes" attached 
to all outgoing messages automatically?

My guess is it is probably not possible, but you never know. Thanks.

 --
Ottavio Caruso