How do lost-backlink alerts work?

Every Monday, ArvaSEO-Bot loads the pages linking to each of your websites to check the links are still there. If some are gone, the website’s managers get one notification that week, linking to the lost links. It’s worth asking the sites to put them back, especially the authoritative ones. To stop the emails, open Account settings → Email notifications and turn off Backlinks; the alerts still appear under the bell.