Today I started receiving emails addressed to a completely different Gmail address from mine. They are legitimate emails from Facebook and Microsoft about new accounts being set up, confirmation numbers, etc. They are not phishing and all links in the emails are legitimate.
It's not possible that both Microsoft and Facebook accidentally BCCd me on some random person's new account confirmation emails, nor is it possible that the addressee is responsible.
Gmail customer service is non existent, but this really appears to be Google routing someone's emails to the wrong mailbox, which is exceedingly concerning. What to do?