People who use Istos Agent write to others from their own address, and each message goes out only after they approve it. If you do not want to hear from any of them, give us your address.
We email you a link. Confirm it and your address is blocked on every Istos Agent account. We keep only a one-way fingerprint of it, enough to recognise it and nothing else.
To stop one sender only, use the link in their email, or reply to them. How this works is on the compliance page.