The Mailer Daemon failure notice to your Daemon mail account, whenever the mail server cannot deliver the mail to the recipient. There are many reasons for email delivery failure.
Inside the Failure Notice:
After the mail server fails to deliver the mail to the recipient address, the Daemon mail system sends the failure notice, which has the reason for the failed delivery, ultimately notifying that the message did not reach the receiver.
Causes of the mail delivery failure:
Mailer Daemon Failure Notice Spam:
It is not always a genuine failure notice; sometimes, the hackers use the sender’s address present in the email header to send spam emails to the sender. The spam email contains a corrupted message, link, or attachment. If you open the email to check the mailer daemon failure notice, you are opening the malicious mail. When there are several failure notices from Mailer Daemon, it means someone is accessing your email account without you knowing, or the mails denote the presence of unwanted data on the system.
Ways to Fix the Failure Notice Emails:
1. Mark ‘spam’
2. Scan the Device