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Nov 26, 2021 · Your message wasn't delivered because the recipient's email provider rejected it. Diagnostic information for administrators: Generating server: ???????????.?????????????.PROD.OUTLOOK.COM
- Undeliverable
I've been receiving "Undeliverable" email from Microsoft...
- Delivery Failed
If you receive an error that a message is undeliverable,...
- Undeliverable
Sep 11, 2024 · I've been receiving "Undeliverable" email from Microsoft Outlook since August 24. The email says "Your message wasn't delivered because the recipient's email provider rejected it." The recipient checked on their side but can't see any issue why this would suddenly happen.
- Overview
- Can't connect to remote server/message expired
- Connection timed out
- Email could not be delivered to members from the group
- Errors that include "blocked" or "listed in" and references to sites like "spamcop," "dynablock," "blackhole," or "spamhaus"
- Host unknown or Domain lookup failed
- Mailbox full or Quota exceeded
- Mailbox not found, Invalid mailbox, or User unknown
- Mailbox unavailable
- Message too large
When you send an email and receive a delivery failure message, there could be several reasons. We've listed the most common error messages below, along with suggested resolutions.
Select an error below to see more information.
Try this fix: This type of error should fix itself over time. If your error message says that the recipient's email provider will keep trying to deliver your message, you don't need to take any further action. Otherwise, wait a short time and then resend the message.
Try this fix: This type of error should fix itself over time. If your error message says that the recipient's email provider will keep trying to deliver your message, you don't need to take any further action. Otherwise, wait a short time and then resend the message.
Try this fix:
1.Review the email addresses that are shown in the error report. Are they correct?
These terms are used when your message has been intentionally blocked by a spam or blacklist filter on the recipient's email server. The recipient's server believes that the mail server or mail account that you're using is a source of spam.
Try this fix: You can contact the support team for the recipient's email provider and request to have your account or domain unblocked.
If you receive one of these messages, the domain for the recipient's email address doesn't exist. If their email address is someone@example.com, the domain is example.com.
Try this fix: Check the recipient's email address for typos. Ensure you have the current address and that their email service provider hasn't made a change to their domain name.
This message means that the recipient has too many messages in their inbox. Many email systems prevent users from receiving any new mail until they reduce their mailbox size.
Try this fix: If you have another way to contact the recipient, let them know that their mailbox is full.
If you receive one of these messages, the address you used doesn't exist. This could be because the recipient's address has changed or the recipient's email account has moved.
Try this fix: Check the recipient's email address for typos. If you have another way to get in touch with the recipient, see if they have a new email address.
Often, this error message has the same cause as the Mailbox not found message. However, occasionally there's a problem with the recipient's email account that will resolve itself over time.
Try this fix: Wait a short time and try to send your message again. If that fails, check the recipient's email address for typos. If you have another way to get in touch with the recipient, see if they have a new email address.
Most email service providers impose a limit on the size of messages their users can send or receive. Your message is too large for the recipient's email server.
Try this fix: Instead of sending large attachments via email, upload them to OneDrive and send the recipient a link.
Oct 15, 2024 · If an email message that you send can't be delivered to the intended recipient, Microsoft 365 or Office 365 typically generates an error code and sends a delivery status notification (DSN) to you. This notice is also known as a "bounce message" or "bounce-back message."
Mar 14, 2024 · You can run an automated diagnostic to identify issues that affect email delivery, and find suggested solutions to fix the issues. Select Diag: Troubleshoot Email Delivery to launch the diagnostic in the Microsoft 365 admin center.
Aug 23, 2013 · It is possible that the filter settings of your account are affecting the delivery of incoming messages to your mailbox. You may check out the following steps below on how to configure the filter settings of your account:
People also ask
Why was my message not delivered?
Why is my email not sending a message?
What causes a message to send a wrong email address?
Why is the sender's message rejected?
What happens if a remote mail server doesn't accept a message?
How do I troubleshoot email delivery in Microsoft 365?
A response from the from postmaster@outlook.com, postmaster@microsoft.com, or service.microsoft.com usually means the message you tried to send couldn’t be delivered to one or all the intended recipients. How to fix the issue and resend the message. Review the postmaster message for possible reasons why your message was undeliverable.
