The question was "How do you know the email comes from that website? "

And the answer was, I can find out if the email is from abc.com by looking at the link, which should also be abc.com

I don't click in "track.monkey.exe". I don't click tracking links. I pay a lot of money for my newsletter provider because I can turn off (most) tracking links.

The question was framed that way but in fact this conversation isn't about your personal resistance to a particular scam vector.

Many sites do offload 100% of their emailing to 3rd party trackers. Therefore nobody can use those sites without engaging in 3rd party tracking. Therefore these sites have created an environment favorable for this scam vector.