Some ISPs generate bounces if those addresses are invalid, and that’s what you’re seeing. Spammers have “spoofed” the email so it looks like it’s coming from you, and then blasted it out to anything they can find that looks like an email address. You’ve probably received bounce messages for email you didn’t send. Why? To avoid flooding the internet with even more noise. With the ever-increasing influx of spam, many ISPs choose to ignore mail destined for invalid or closed destinations. While you might think of some of those states as being “closed”, not all of them will cause a bounce, and none of them require a bounce. The account no longer exists (or never did).The account existed, but is now closed.Email may still accumulate without bouncing until cleanup happens after some period of time. The user could have “closed” the account, but the ISP hasn’t released or deleted it yet.There’s nothing here that would cause a bounce. Email will be successfully received and accumulate. I have to ask what you mean by a “closed” account in your question. Hopefully, the error message contained in the bounce tells you why it bounced. The email you sent has not been delivered, and is thought of as having “bounced back” to you. Usually, though not always, the error message includes the original email. Just to be clear, “bounce” is the term we use when email we send causes an error message (also in the form of an email message) to return to us. Unfortunately, about the only thing you can count on is that you cannot count on bounce messages. They can help you fix a problem with an email you’ve sent, or they can simply be another message in a big pile of spam. Email bounce messages are both annoying and informative.
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