Mailer-Daemon

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Mailer-daemon is email server software responsible for message delivery. Messages from mailer-daemon@example.com usually indicate a problem with the recipient's mail server or address. For example, a common problem that causes a mailer Daemon message is sending a message to an incorrect e-mail address. You may receive email bounce-back messages from mailer-daemon that were not yours to begin with, but unsolicited commercial email bounce-backs. If you send legitimate email to a valid account and still get responses back from mailer-daemon, your domain may be on a blacklist.