I discovered something very odd a few days ago. I went into a Yahoo account I have only for a specific purpose and discovered there an email from a friend. Since I've never given my Yahoo address to any friend I'm baffled. She says it was sent to my Gmail address. I have it as a recovery address with Gmail (having no third account) and with EE, which is my ISP.
Does anyone have any insight please? I've asked Gmail through their forum but with no result.