What is Mailer Daemon?


A “Mailer Daemon” is an e-mail message indicating a malfunction on mail servers. This e-mail address is automatically created by a “postmaster” (Specifies that manages the messages, users and problems on a server e-mails). This message is generated if for example the email address of the caller is incorrect, or that a failure occurs at the destination mail servers.

Most Mailer daemon are in English. It is then necessary to have some basic skills in the language of Shakespeare to understand the content. Here are some tips to understand the dark side of these messages provide valuable information on the origin of the problem.

Examples of mailer daemon frequently encountered. (There may be others)

  •     MAILBOX NOT FOUND: means that the e-mail address of your correspondent does not exist or is poorly using your e-mail address , the mailer daemon will be “User unknown” when the front the @ is misspelled or “unknown Host” when the domain name (after the @) is not correct.
  •     MAILBOX FULL: means that the mailbox is full and the caller must free that space to receive new e-mails.
  •     User name IS NOT MAIL FROM THIS SENDER Accepting: means that your device does not accept your email because it defined filter settings at their inbox.
  •     EXCEEDS MAXIMUM MESSAGE: means that the size of your e-mail and / or (of) file (s) O (s) is too large. In case, you must compress your files before sending them.
  •     MAILBOX BUSY: indicates that the box is blocked caller, saturated with too many e-mails waiting to be read.

If the Mailer Daemon is actually sent emails, all is well. Otherwise, two options:

  • it may be that it is a virus that sends emails on your behalf,
  • or someone has passed for you to send emails.

In the case where a multitude of mailer daemon are received, check your PC because it is possible that behind it lies a mail bomber. Its purpose is to replicate and send itself as an attachment to the email address that collects on your PC (like address book, websites with email addresses, Network Neighborhood, etc. …)

Also, if you suspect that your email account has been hacked:

change your password,
also change your secret question and answer.

If the problem persists, scan your computer for viruses, bots, malware, etc. … some websites offer online scan your workstation. This is the case of this site. http://www.kaspersky.com/virus-scanner