I've received email I've never sent. How does it work? Here are some examples of subject:



Often it's spam send by spammers. They use existing email addresses, such as admin@fsfejinfo.net. Then they have more change that the message will be received and not deleted immediately. This message was sent to non-existent recipient, that is why the email returned to the address it was send from.

There isn't a solution to this problem. We cannot block the emails returning to admin@fsfejinfo.net because this is a real address.
You may at least try to filter messages by subject:
Log into Manager v3.
Choose "Emails" , then "POP accounts" and next "Filters" . Create an appropriate filter for your problem.