SimpleLogin

SimpleLogin is an open-source email aliasing service by Proton that helps users protect their real email address. It lets users create unique aliases for sign-ups, forward messages to existing inboxes, reply or send from aliases, use custom domains and catch-all aliases, enable PGP forwarding, and manage aliases through web, browser extensions and mobile apps. It is best understood as a privacy-focused email alias layer rather than a full hosted mailbox.