If you send text messages to Australian numbers using an Alphanumeric Sender ID, there’s an important change coming.
From 1 July 2026, the Australian Communications and Media Authority (ACMA) requires every branded Sender ID to be registered on the new SMS Sender ID Register. If yours isn’t registered in time, your messages may be relabelled as “Unverified” and grouped with other unverified messages (including scams) on your customers’ phones. Not a great look for a message you wanted them to trust.
Registering is straightforward, and we’ve built it into the Enfonica Console. The confusing part about the SMS Sender ID Registry isn’t how to register, but what can I register. This post walks through the new rules with plenty of examples, and covers a question we get asked a lot: What happens when you’re sending messages on behalf of someone else.
Note: All business names below are fictional and used purely as examples.
The golden rule
ACMA created the Register to make it harder for scammers to impersonate real businesses. So the single most important rule is this: Your sender ID must be clearly linked to your organisation.
A Sender ID isn’t a free-text slogan. It’s a label that tells the recipient who a message is really from. If it doesn’t point clearly back to a real, identifiable organisation, it won’t be approved.
The format rules
A Sender ID must:
- Be 2 to 11 characters long.
- Use only standard printable characters (letters, numbers, common symbols).
- Not be made up entirely of numbers.
- Not start or end with a space or underscore.
- Not contain the word “Unverified”.
- Not be offensive, deceptive or misleading.
- Not consist solely of a generic or restricted word.
Sender IDs aren’t case-sensitive, so “ACMECorp” and “acmecorp” are treated the same.
That last point catches people out. A generic term on its own, like “Alert”, “Bank” or “Survey” won’t be accepted, because anyone could claim it and it tells the recipient nothing. The fix is simple: pair it with your name, eg. “ACME Alert” is acceptable.
Linking the Sender ID to your business
If you have an ABN, your Sender ID must match one of: your registered business name, your company name, a registered trademark you hold, or a domain name you legitimately use for a website.
ACMA also allows sensible flexibility. Your Sender ID can be an exact match of your name, a shortened version (“Australia Post” → “AusPost”), an acronym (“Australian Communications and Media Authority” → “ACMA”), or your name plus extra words describing your role, location or message purpose (“ACMA Alerts”).
The key thing about that last one: while the extra word is added to your identity, it doesn’t replace it. “ACMA Alerts” works because “ACMA” is still there. “Alerts” on its own does not.
Registering your own brand
If you send under your own business name, this is the simple case. Say you run Brightwater Dental.
Typically allowed:
| Sender ID | Why it works |
| “Brightwater” | Shortened version of the business name |
| “BWDental” | Acronym-style shortening that still links to you |
| “BWDentalApt” | Your business name plus a purpose word (appointments) |
Typically rejected:
| Sender ID | Why it fails |
| “Appointment” | Generic word, no link to your business |
| “YourDentist” | Doesn’t match your name, trademark or domain |
| “Dental” | Generic term on its own |
The test is always the same: does this clearly point back to my registered name, company name, trademark or domain? If you’re relying on a domain, make sure it’s one you genuinely use. A parked domain you bought last week won’t carry the same weight as your live website.
Sending SMS on behalf of someone else
This is where it gets interesting, and it’s worth getting right. Plenty of Enfonica customers don’t send under their own name at all. They send on behalf of their customers. That includes wholesale partners, agencies, and market research firms.
The crucial principle: The valid use case must be proven against the organisation the Sender ID represents, not whoever presses “send”.
It’s not about who operates the platform. It’s about whose brand appears at the top of the message, and whether that entity has a valid use case.
Example: a market research firm
Say Great Market Research runs surveys for a range of clients, sending all the SMS invitations through Enfonica…
Scenario 1 — under their own brand.
Great Market Research sends survey invites that appear from “GreatMarket”. Easy — it matches their own registered name. Variations like “GreatSurvey” work too, because their identity stays front and centre.
Scenario 2 — a generic, descriptive name. Now Great Market Research wants SMS surveys to be sent from the Sender ID “CarSurvey” because the project surveys people who own a car. This is the trap. “CarSurvey” contains nothing that links back to Great Market Research: no name, acronym, trademark or domain. It’s purely the message’s purpose, so it would be rejected. It doesn’t match the organisation’s identity, and a sender-anonymous label works against the whole point of the ACMA’s Register.
Scenario 3 — the Sender ID belongs to the client.
Say Great Market Research runs a patient survey for its other client, Brightwater Dental, and the messages should appear from Brightwater so recipients recognise them. Here, the valid use case belongs to Brightwater, not Great Market Research. The Sender ID must be registered against Brightwater’s identity, with Brightwater’s authorisation. The fact that Great Market Research operates the sending is irrelevant to the use-case test.
The same logic at a glance:
| Sender ID | Sent by | Allowed? | Why |
| Great | Great Market Research | ✅ | Matches their own name |
| Brightwater | Great Market Research, on behalf of Brightwater Dental | ✅ | Registered against Brightwater’s identity, with their authorisation |
| NewSurvey | Great Market Research, on behalf of Brightwater Dental | ❌ | No link to Great Market Research or Brightwater’s name, trademark or domain |
| Survey | Anyone | ❌ | Generic word on its own |
Things worth knowing
- Registration is per-provider: The Register records which provider is authorised for a given Sender ID. If you send the same Sender ID through more than one provider, each must be authorised separately. Registering with Enfonica authorises Enfonica, not your other providers.
- One Sender ID, multiple organisations: A single Sender ID can be registered by more than one organisation, as long as each can independently show a valid use case. This is useful when more than one legitimate business shares a similar brand.
How to register with Enfonica
We’ve built the submission process into the Enfonica Console so you don’t have to wrangle government portals alone:
- Go to Cloud SMS → Sender IDs and click Register Sender ID.
- Tell us how the Sender ID links to the organisation — business name, company name, trademark or domain.
- Nominate an authorised representative who can confirm the registration with ACMA.
- Submit, and track the status in the Enfonica Console.
There’s a government identity step on ACMA’s side too (involving myID and your Australian Business Register details), so it pays to start early. Our full Sender ID Register guide walks through every step.
Register today
The deadline is 1 July 2026, but ACMA recommends applying well before then to allow time for review and approval. Leave it too late and your branded messages risk showing as “Unverified”.
Not sure whether your Sender ID will pass the valid use case test, especially if you send on behalf of clients? Get in touch with Enfonica Support. We’re happy to look at it with you before you lodge, so there are no surprises.
At Enfonica, we believe good communication builds trust. The Sender ID Register is a new ACMA requirement, and registering is now part of sending branded messages to Australian numbers. We’re here to ensure you meet the requirements and to make getting registered as painless as possible.
