Author of this article：Miya, Search engine optimization expert

FacebookAlthough the messaging system is rich in functions, the messaging process is affected by many factors. Whether it is an unstable network connection, a restriction set by the recipient, or a problem with the application itself, the message may not be delivered smoothly. Understanding these potential causes and corresponding solutions can help users quickly find solutions when they encounter transmission failures and ensure the continuity and effectiveness of communication.

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Common causes of “undeliverable” Facebook messages and corresponding solutions

1. The other party has blocked or restricted your account

If you display “undeliverable” or a red exclamation mark when you send a message to someone, one of the possible reasons is that the other party has blocked your account or set privacy restrictions. After being blocked, you will not be able to send a message to the other party or view the other party's dynamics, and the message delivery status will display “Not delivered.”

solution：

• Check the status of your friend relationship with the other party and confirm whether you are blocked by the other party.
• If the other party does not unblock you, you will not be able to send a message, you can only contact the other party in other ways or wait for the other party to unblock you.

2. Recipient's message reception settings

Facebook allows users to set message receiving permissionsTo prevent strangers or non-friends from sending messages. If the other party's privacy settings restrict non-friend messages, your message may be marked as an “information request” or automatically filtered out in rare cases.

solution：

• Send a friend request, try to establish a friend relationship first, and then send a message.
• If the other party does not accept the friend request and the message fails to be sent, you can check the other party's privacy setting requirements to confirm whether you meet the other party's receiving conditions.

3. Network connection problem

Unstable network connection or weak signal may also cause Facebook messages to fail to be sent. When the network signal is poor or the connection is unstable, the message may display a red exclamation mark prompt, indicating that the transmission failed.

solution：

• Check whether your Internet connection is normal and make sure that the Wi-Fi or mobile data signal is strong enough.
• Try to reconnect to the network, or resend the message when the network is stable.

4. Facebook server or application failure

In some cases, Facebook servers orMessenger appTemporary problems may occur, causing the message to fail to be sent. Such failures usually affect multiple users, causing messages to fail to be delivered.

solution：

• You can try to wait for a few minutes to resend the message, or close and reopen the Facebook or Messenger app.
• If the problem persists, it is recommended to check the official Facebook social media or status monitoring website to see if there is an announcement of a server failure.

5. Account violation restrictions

If Facebook detects improper behavior in your account (such as spam, a large number of messages from strangers, etc.), it may restrict your account. At this point, you may find that the message failed to be sent or an “undeliverable” prompt appears.

solution：

• Check your Facebook notifications to see if you have received any restrictions or warnings.
• If your account is restricted, it is recommended to contact Facebook customer service or check the support center's guidelines to remove the restrictions as prompted.

How to solve the red exclamation mark in a Facebook message?

If a red exclamation mark appears in a message sent in Facebook or Messenger, it means that the message failed to be sent. The following are a few common solutions：

1. Resend the message: Click the red exclamation mark, the resend option usually appears, click to try sending again.
2. Check the network connection: Ensure the stability of the network, resend the message after switching to a stronger Wi-Fi signal or reconnecting to the data network.
3. Update the Facebook app: Sometimes, an older application version may cause a message to be sent incorrectly. Check if the application has an updated version and upgrade in time.
4. Clear cache: For Messenger on mobile devices, try to enter the device settings and clear the app cache to eliminate the cache problem.
5. Switch equipment: If the above method is invalid, you can try it on other devicesLog in and resend the message, Eliminate problems with the equipment itself.

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