What is mailer daemon message
A Mailer Daemon message, also known as a "bounce" or "undeliverable" message, is an automated email message sent by a mail server or email service provider when an email cannot be delivered to its intended recipient. This message is generated by the Mailer Daemon, a software component responsible for handling email delivery.
When an email is sent, the Mailer Daemon checks the recipient's email address and attempts to deliver the message. If the email address is invalid, does not exist, or is blocked by the recipient's email server, the Mailer Daemon will send a bounce message back to the sender's email address.
The bounce message typically includes information about the reason why the email could not be delivered, such as:
- The recipient's email address is invalid or does not exist.
- The recipient's email account is full or has exceeded its storage limit.
- The recipient's email server is down or experiencing technical issues.
- The recipient has blocked the sender's email address or IP address.
- The email message is too large or exceeds the recipient's email server's size limits.
The bounce message usually contains the following information:
- A notification that the email could not be delivered.
- The reason why the email could not be delivered.
- The recipient's email address.
- The sender's email address.
- A reference number or error code.
Here's an example of a typical bounce message:
Subject: Undeliverable: Your email to [[email protected]] could not be delivered
Dear [sender's email address],
The following email address is not valid or does not exist: [[email protected]].
Please check the recipient's email address and try sending the email again.
Best regards, Mailer Daemon
Bounce messages are an important part of the email delivery process, as they help prevent email spam and abuse by identifying invalid or non-existent email addresses. They also provide valuable feedback to senders, allowing them to correct errors and improve the delivery of their emails.