What is Mail Delivery Subsystem?

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What is mail delivery subsystem?

"Mail Delivery Subsystem" is a warning email that informs the sender when an email cannot be sent correctly .
The email has a sender and subject line "Mail Delivery Subsystem" and an error message written entirely in English.
If the text is garbled in Japanese, the error message may be difficult to understand, but even if you cannot understand the content, do not delete the email without carefully checking it.

In fact, many people delete emails they think are spam or france mobile database contain viruses.

What is MAILER-DAEMON? How it differs from the Mail Delivery Subsystem
Like the Mail Delivery Subsystem, MAILER-DAEMON sends a warning message to the sender when an email was not sent correctly.

There is no big difference between these two. They are just used depending on the destination system, but in either case, the email will not reach the destination.

*From here on in this article, the term "Mail Delivery Subsystem" also includes MAILER-DAEMON.

Main reasons why Mail Delivery Subsystem is received
mail delivery subsystem cause

From here, we will introduce the main reasons why you may receive a Mail Delivery Subsystem message:

The recipient's email address is incorrect
There is a problem with the destination mailbox
The destination mail server is not responding
The recipient's email address is incorrect
If the recipient's email address is incorrect , you will receive a Mail Delivery Subsystem message.
There are two main reasons why the recipient's email address is incorrect:

User unknown: @The previous user name or account name does not exist
Host unknown: The host name after @ does not exist