unsubscribe from this list solution?

Hi, I am trying to send emails using GMAIL, or maybe even a smtp setup on my pc, just like a normal email service provider *ESP with a working unsubscribe button / link that only uses my domain name. ALL ESP's like mailchimp sendinblue etc, redirect that button to some weird branded subdomain of theirs.

I want things clean.

This is not for MASS mailing, 10 emails a week. highly personalized BUT COLD emails. With a real company LLC so I MUST adhere to unsubscribe rules and laws. Hoping for FREE solutions.