@JPH1 You are quite right.
But you should be able to learn from that, that these are 1 pixel images.
Sometimes (actually most times) you will never notice them but blocking can be simply by denying display of external images.
I am told there are also third party apps that supposedly block these trackers... but they may be tracking you themselves.
I am not sure if just enabling Vivaldi's Tracking Blocker will do this. You will have to go through the Help or ask Vivaldi Moderators/Testers/Team members.
Having been raised in a text environment, not using HTML formatting in mail doesn't bother me, but I can understand others may be used to it or depend on it. Turning off "External Images" is the only sure I way I know of so far.
Sorry I can't help further. Perhaps someone else here has some ideas.
[EDIT] According to this article if you change your DNS to AdGuard it will block trackers. That may work for you but it will block some sites.
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