Message rejected (SMS)

If, when sending an SMS campaign, the message is rejected, it will appear in our statistics as "Undelivered". That the message is rejected means that, in this case, it has not reached its recipient because the operator has not been able to deliver it due to restrictions that the recipient has decided to establish for their mobile number.

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What does it mean when an SMS is rejected?

A rejected message is one that is not delivered to the recipient because it has been blocked at some point in the sending process. This does not necessarily imply a technical failure of the sending system, but can be due to multiple external causes, such as operator restrictions, number errors or anti-spam policies.

What are the most common causes of rejection?

Some of the most common reasons why an SMS may be rejected include:

The destination number does not exist or is incorrect.
The recipient's device is switched off or out of range for an extended period of time.
The number is unsubscribed or blocked from receiving commercial messages.
The content has been detected as potentially fraudulent or does not comply with the operator's policies.
Sending limits have been exceeded by the sender.

How do you know if your messages are being rejected?

SMS delivery platforms often provide delivery reports detailing the status of each message. These reports may show the category ‘message rejected’ along with specific error codes provided by the operator. Regular review of these reports is key to detecting patterns of failure.

What are the consequences for your campaigns?

A high volume of rejected messages directly affects the effectiveness of your campaigns and can damage your reputation as a sender. In addition, if you do not take corrective measures, operators may limit the traffic of your future mailings.

What can you do to avoid rejections?

Periodically check your database and remove invalid numbers.
Make sure you have the user's consent to send them communications.
Be careful with the content of your messages, avoiding aggressive commercial expressions.
Check with your SMS provider the limits and sending rules for each country or operator.
Carry out preliminary tests before each campaign to detect possible blockages.

Avoiding rejections not only improves the delivery rate, but also the efficiency and return of your SMS marketing campaigns.