I received and email "thanking me for contacting them". I didn't know they existed, and the email has my name "Judy" and the body of the letter said, "Thank You Julie".
The unsubscribed located at the bottom of the email, as required was dead - I couldn't unsubscribe, but there was a "unsubscribed by the senders name that was turned on. I didn't click on it because I didn't know if it was a scam, a link to attach to my computer.
The body of the email also said: to confirm.
I don't know if someone working at OfferUp is taking emails and signing people up or if someone used my email - which I have had done by another company.