Important update on Spain's SMS sender registration regulation — the blocking timeline may be pushed back to September 15, 2026.
If you've been following the SMS sender ID registration regulation in Spain closely, you may have received urgent communications about the June 7, 2026 deadline. There's a significant development: Spain's Ministry for Digital Transformation has opened a public consultation that points to a meaningful delay of the blocking measures until September 15, 2026.
Here's what happened, what it means for your business, and what we recommend doing next.
What exactly happened?
CNMC Circular 1/2026 established that, from June 7, 2026, Spanish mobile operators would be required to automatically block messages sent with unregistered alphanumeric sender IDs.
However, the Ministry for Digital Transformation and Public Function has now opened a public consultation to amend that regulation. The proposal would delay the blocking measures until September 15, 2026, acknowledging the operational difficulties the industry has faced during the adaptation process.
The CNMC itself has recognised in this proposal that the original deadlines were tight and that the adaptation process needs more time than initially anticipated.
What additional measures does the proposal include?
What does this mean for your business?
Important
This amendment is still pending final approval. Until it becomes official, the current regulation — CNMC Circular 1/2026 with June 7 as the reference date — remains in force.
If the proposal is approved as planned, businesses will have more time to complete registration without risk of immediate blocking. However, this does not mean registration is no longer mandatory — it simply means the enforcement timeline would be extended.
Our recommendation is clear: continue with the registration process. Using this additional time to complete the process without rushing is the best decision, as registration will remain mandatory regardless of the final blocking date.
Updated timeline
| Date | Status |
|---|---|
| June 7, 2026 | Original date — likely to be delayed |
| September 15, 2026 | Proposed new date — pending approval |
| Alias registration | Still mandatory regardless of the timeline |
What is Instasent doing?
At Instasent, we continue to actively work on:
- Registering our clients' aliases with the CNMC.
- Adapting our processes to regulatory developments in real time.
- Keeping you informed of any official updates as soon as they happen.
Haven't registered your alias yet?
Use this extra time to complete the process without the pressure.
Register my alias →Want to understand the regulation from the beginning? Read our full guide to CNMC Circular 1/2026 and our step-by-step guide to registering through Instasent.
Sender registration remains mandatory regardless of the new timeline. If you haven't completed the process yet, do it now from your dashboard at Settings > Organization > Legal Profile. Any questions? Contact us with the subject "CNMC Registration".
