Hi,
No need to call an exorcist if you get an email from the Mailer-Daemon; this is just a message from the email server itself. Usually you only hear from the email server when it has trouble delivering an email you sent. It also means that the original message is said to have bounced.
Tecnically say that software in a mail server that delivers messages to recipients. When you get a MAILER-DAEMON@whatevercompany[dot]com message in your inbox, the server at that company is informing you that it is returning your message because of some failure. The "to" e-mail address may no longer be valid, or there may be a problem routing the message to the appropriate mail server. Your domain name may be on a blacklist, and the server is refusing all incoming messages from it.
Chances are also good that you never sent the message in the first place. Your e-mail address could have easily been copied by a worm from someone else's address book and used as a "from" address without your knowledge.
You know, errors can occur at multiple places in mail delivery. A user may sometimes receive a bounce message from their own mail server, and sometimes from a recipient's mail server. With the rise in forged spam and e-mail viruses, users now frequently receive erroneous bounce messages sent in response to messages they never actually sent.
It's now hard to say wat is the actual reason as there are many reasons why an e-mail may bounce. One reason is if the recipient address is misspelled, or simply does not exist on the receiving system. This is a user unknown condition. Other reasons include resource exhaustion — such as a full disk — or the rejection of the message due to spam filters.
Bounce messages in SMTP are sent with the envelope sender address <>, known as the null sender address. They are frequently sent with a From: header address of MAILER-DAEMON at the recipient site.
Typically, a bounce message will contain several pieces of information to help the original sender in understanding the reason his message was not delivered:
* The date and time the message was bounced,
* The identity of the mail server that bounced it,
* The reason that it was bounced (e.g. user unknown or mailbox full),
* The headers of the bounced message, and
* Some or all of the content of the bounced message.
I hope these peices of information could help you identify the specific reason to your instance.
Eric,
http://ezones.blogspot.com