Hosting is DreamHost. Their servers will log IP addresses, user agents, and timestamps in the ordinary way. We do not sell mailing lists.
The contact and newsletter forms send the fields you type (and, for contact, a hidden honeypot). Email is used to reply or to send the letter you asked for. Unsubscribe will be honored.
Amazon Associates links include tracking that Amazon uses to credit a purchase. We do not see your full Amazon account. If we add analytics later, this page will name the vendor. We will not add a creepy overlay in the meantime.
Do not send medical details or anyone else’s private information through the contact form. We are not your lawyer or your clinician, and a web form is not privileged.