Unsubscribe question. How to receive an email from the person who clicked on the link in the email?

Question

Email Marketing

I made in the letter from which I am doing the newsletter - the "unsubscribe" link leading to my WordPress site, to the page of unsubscribing from the newsletter. There, the Contact Form 7 opens, in which - "we are sorry that you are unsubscribing ... blah blah" and the button - unsubscribe, as a result of which I receive a letter in the mail. But I also had to add a field to fill in the email, and this is unnecessary violence against the unsubscriber. How can I make sure that I receive an email from which they want to unsubscribe? Maybe it's possible that while clicking the link in the letter - a letter was sent to me that such and such an address should be unsubscribed? And he will open a page on the site that you have already unsubscribed from.
Here it is somehow implemented:
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