Spain introduces mandatory registration for SMS and RCS sender IDs
From June 7th 2026, companies sending SMS and RCS messages to Spanish numbers will need to comply with a new regulation governing alphanumeric sender IDs, also known as aliases.
Under the new rules, any alias used in SMS and RCS messages to Spain must be registered with the National Commission on Markets and Competition (CNMC) and authorized through the messaging provider. Messages sent with unregistered or unauthorized aliases will be blocked.
An alias is the name displayed as the sender of the message; typically a brand or company name. Aliases have been exploited for fraud and impersonation and the regulation aims to address these risks by ensuring that only verified entities can use specific sender IDs.
The registration process requires companies to demonstrate a legitimate link between the alias and their organization. Such as a registered trademark, company name, or domain. Applications are submitted via the CNMC portal using a valid Spanish digital certificate, either by the company itself or through a provider like LINK Mobility. Once submitted, approval can take up to one month.
To ease the transition, a temporary bulk registration window allows companies to register existing sender IDs more efficiently. After this period, all registrations must be handled individually.
Key dates and deadlines
March 27, 2026: Final regulation published
April 2026: Bulk pre-registration window opens
April 28, 2026: Deadline for bulk pre-registration
May 2026: Standard registration process fully operational
June 7, 2026: Enforcement begins, unregistered aliases may be blocked
More information
If you want to read more about the upcoming changes to the sender ID regulation in Spain, you can read this document.
It covers the upcoming changes and the parties involved more thoroughly.
What this means for businesses sending SMS to Spain
Continued use of sender IDs in Spain will depend on proper registration and authorization. Companies already using aliases are advised to act quickly to avoid service disruptions, while those planning new campaigns should factor registration timelines into their rollout plans.
LINK Mobility is closely aligned with the Spanish requirements and is monitoring the implementation of the updated sender ID rules.
Customers sending SMS traffic to Spain are encouraged to review their sender IDs to ensure alignment with the new requirements according to the timeline. Further operational details will be communicated as they become available.
For any questions, please contact LINK Mobility Support.