Translation of the above message:
En In waves (first was a few months ago, second since a few days ago), I receive on my iCloud mail address some non-delivery notices, from mails I didn't send myself, since I don't even know the recipients.
Does somebody know how to solve the problem?
Is there any risk linked to that problem?
En Tentative answer: if somebody is using your iCloud account on your behalf, you better change ASAP your password! (your iCloud personal data may be accessed, also the "person" (?) using your account may know where you are at anytime ... ("Find my iPhone/Pad/Mac...").
By the way I'd like to know if (at last, like Gmail) there is now a way to detect any "unusual connection", like from a distant IP - or, simply, to be able to list the last accesses (IP...)
Fr Tentative de réponse: si quelqu'un utilise votre compte à votre insu, changez le mot de passe rapidement! (Accès aux données perso, "Find my iphome... permet de savoir où vous ètes...)