[Evolution] Send messages as plain text to select recipients

[Vincent Hennebert <vhennebert+evolution gmail com>]

Evolution 3.40.4.

I’ve just sent a message in HTML by mistake to this list because I set
up my preferences to format messages in HTML by default, and forgot to
revert to Plain Text before sending.

To avoid any such mistake in the future I’d like set an override for 
select recipients, but I haven’t found any way to do that. Is that
possible?

Thanks,
Vincent