Call-to-action in e-mail newsletter

Why are you doing e-mail newsletters?

Probably in order to bring subscribers to the site or sell some product ... In this case, it is very important to focus the attention of the person who will receive the letter on what he should do after receiving your letter.

For example, today a letter from a fairly well-known brand got into my mail.
Here is his screenshot:
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Let's see what comes first:
product image
free shipping

And where is the button that prompts us to action, the so-called call-to-action? It is not visible, for this riot of colors.

From the point of view of e-mail marketing, this is a big mistake.
As on the site, the call-to-action in your letter should be the most visible element.
So that even without reading your email, the recipient understood in 2 seconds what he needs to do, do not forget about it!