I'm receicing emails labeled "Delivery Status Notification (Failure)" for emails that I did not send
Here's an example:
|Address not found|
|Your message wasn't delivered to firstname.lastname@example.org because the address couldn't be found, or is unable to receive mail.|
I did not send an email to this address and don't have it in my address book. It is a nuisance, and I need to know if it is a threat to my email account.
I've received twenty or thirty of these messages over the past few weeks.