Mystical message delivery failure reports and what you should do about them
Whenever an email is sent by you to an target that not any longer exist, you will get a reply from the “mailer-daemon” showing that your particular message was not delivered. If the inbox is abruptly overwhelmed with distribution failure reports, it can be caused by somebody delivering email messages from your address without your understanding.
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What’s the Mailer-Daemon?
E-mail works like virtual a postal system. It first goes to a server called the mailer-daemon when you send an message. The message is passed by that server on with other servers before the message is brought to the receiver’s inbox. Whenever distribution fails, a mailer-daemon error message is created and delivered back into the initial transmitter.