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- When you get mail from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject like "Failed Delivery" or similar, it means that an email you sent was undeliverable and has been "bounced" back to you. These messages are produced automatically and usually include a reason for the delivery failure.
www.bt.com/help/email/fix-a-problem/problems-with-email/i-ve-got-a--failed-delivery-message---what-does-this-mean-I've got a "failed delivery message". What does this mean? - BT
People also ask
What if I receive an email from mail delivery subsystem?
Why is my mail delivery subsystem not working?
What does a failed delivery message mean?
How do I know if a mail delivery subsystem email is legitimate?
Nov 5, 2021 · If you receive an email from Mail Delivery Subsystem, an email that you sent failed to deliver. This normally only happens with a single email. To fix this, you need to first determine which email the message bounced from.
May 9, 2024 · If you want to know how to stop mail delivery subsystem messages, you’ll need to get to the root of the problem. Here are the main causes of email delivery failures: 1. The recipient’s inbox is full. A simple yet common reason for mail delivery subsystem messages is the recipient’s inbox being full.
The most common reason for a failed delivery is that the email address you entered isn't valid. If the Mailer Daemon says that the account doesn't exist, double-check the spelling of the address you entered. A single misplaced letter can be enough to cause a failed delivery.
Dec 6, 2022 · If your Mail Delivery Subsystem email indicates that the address, mailbox, user, domain or host is not found, unknown, unavailable or unrouteable, then you need to double-check the email address you are using.
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Jun 27, 2023 · A "Failed Delivery" message from the mail delivery subsystem means that an email you tried to send couldn't be delivered. The message should include more information about why the delivery failed, such as the recipient's email address being incorrect or their inbox being full.
Aug 29, 2011 · As usually, the answer is it depends. On the protocol level, as explained in the other answers, the delivery of email happens separately for each recipient, and failures should be reported for each recipient (though a mail server may choose to send a single failure message for multiple recipients).
