You send a 5,000-contact flash sale. Your dashboard says "delivered." Revenue barely moves. You blame the offer, the timing, the audience. The actual problem might be the eight characters after bit.ly/ — a link on a domain that thousands of other senders, including outright spammers, are also blasting through carrier networks right now.
Full disclosure: I work for ReadySMS, so I have a horse in this race. But this is one of those problems where the fix is cheap, the mechanism is dull and technical, and almost nobody explains it before you've already burned a campaign. So here's the plain version.
Why "delivered" doesn't mean "delivered"
The word "delivered" in most SMS platforms means the carrier accepted the message for handling. It does not mean the handset lit up. Carriers run spam analytics between "accepted" and "shown to the human," and a message that trips those filters gets silently dropped or dumped into a spam folder the recipient never checks. You get no bounce, no error, no signal. The message just… evaporates.
That silence is the whole problem. A hard failure you'd fix in an afternoon. A silent filter you'll chase for months, testing send times and copy, never suspecting the URL.
Links are one of the loudest signals in that filtering model. And a shared public shortener is about the worst link you can put in a text.
The mechanism: shared domains carry shared reputation
Carrier spam systems score messages on a bundle of signals — sending number reputation, message content, send velocity, and the reputation of any domain in the body. That last one is where public shorteners fall apart.
When you use bit.ly, tinyurl.com, or any free public shortener, your link rides the same root domain as every other user of that service. Carriers can't see your destination page from the short link — they see bit.ly. So they score the reputation of the shortener domain itself, aggregated across everyone using it.
Here's the part that stings: a huge share of the messages carrying public-shortener links are exactly the traffic carriers built these filters to stop — phishing, package-delivery scams, fake bank alerts. Those campaigns love free shorteners because they're disposable. So the domain accumulates spam complaints, gets flagged, and its reputation tanks. Your perfectly legitimate abandoned-cart text inherits that reputation the moment you paste in a shared short link.
You didn't do anything wrong. You just parked your car in a neighborhood the carriers already redlined.
Before and after: the same message, two domains
Rough framing, not a lab result — treat these as directional, because actual delivery depends on your number's standing, your content, and the carrier:
| Signal | Shared public shortener | Branded / dedicated short domain |
|---|---|---|
| Domain reputation | Aggregated across all users, including spammers | Yours alone — only your traffic affects it |
| Carrier scoring | Inherits the domain's baggage | Scored on your behavior only |
| Filtering risk | Elevated, and invisible when it hits | Sharply lower once the domain seasons |
| Recipient trust | bit.ly/x8Fq2 reads generic/sketchy | shop.yourbrand.co/sale reads legit |
| Traceability | You can't isolate your own reputation | Clean signal you can actually manage |
The recipient-trust row matters more than people expect. A person who half-remembers signing up for your list sees yourbrand.co/... and clicks. The same person sees bit.ly/x8Fq2 and — after years of scam texts — thumbs it straight to spam. Every one of those reports feeds back into the carrier's model and makes the next send worse.
What a branded short domain actually is
You buy a short domain — ideally a subdomain of your real brand, like go.yourbrand.com or a cheap short TLD such as yourbrand.co or ybrnd.link. Then you route your shortened links through it instead of a public service.
The reputation on that domain is built by your traffic and only your traffic. Early on it's neutral — an unknown domain, not a bad one — which already beats inheriting a flagged public domain. As you send clean, opted-in campaigns and complaint rates stay low, the domain seasons into a positive reputation carriers learn to trust. You now own an asset instead of borrowing a liability.
The costs are modest:
- Domain registration: roughly $10–$40/year depending on the TLD. A
.linkor.coshort domain is on the cheaper end. - Link-shortening/routing: either a branded-link tool or the link handling inside your SMS platform. Some platforms do this natively; a standalone branded-link service typically runs a low monthly fee.
- Time: an afternoon of DNS setup, then a couple of weeks of clean sending to season the domain.
Compare that to the cost of a flash sale that quietly under-delivers. If a 5,000-contact send at a $40 average order value loses even 10% of clicks to silent filtering, you're looking at real four-figure revenue you never see. A $20 domain is not the expensive line item here.
Where this fits in the bigger deliverability picture
A branded domain is one lever. It won't rescue a campaign that's broken in other ways, and it's honest to say so. The link is one of several signals carriers weigh, and the others still have to be in order:
- Registered 10DLC. Unregistered traffic gets filtered regardless of your links. If you haven't registered your brand and campaign, start there — our 10DLC explainer walks through it, and the registration cost breakdown covers the ~$10/mo brand + ~$20/mo campaign carrier fees.
- A dedicated sending number. Sharing a number with hundreds of other businesses causes the same aggregated-reputation problem as sharing a link domain. We break that down in why sharing a number gets your texts filtered.
- Clean content. SHAFT-flagged words and sketchy phrasing get campaigns rejected before a single link is scored — see decoding a 10DLC rejection.
- A real opt-in list. No domain trick outruns high complaint rates. If people don't remember signing up, they report, and reports poison everything upstream.
If you want the ecommerce-specific version of this exact link problem, we went deeper in why your bit.ly links are getting your ecommerce texts blocked and the underlying carrier reputation mechanism.
How ReadySMS handles the carrier layer
ReadySMS sits as a thin layer over carrier infrastructure and routes across multiple providers for redundancy, so the deliverability signals that matter get handled where they should — at the carrier registration and routing level, not bolted on after the fact.
Concretely, that means full A2P 10DLC brand and campaign registration in-app, automatic STOP/opt-out propagation so a complaint on one campaign doesn't follow you into the next, quiet-hours enforcement, and litigator/DNC scrubbing before send. Those keep your sending number's reputation clean — which is the other half of the equation a branded domain can't fix on its own.
The branded-domain move is still yours to make: register a short domain, point it at your link routing, and stop borrowing bit.ly's baggage. Pairing a clean domain with a clean registered number and a genuinely opted-in list is what actually moves "delivered" toward "read."
One caveat before you go domain shopping
If you send very low volume — a few hundred texts a month, from a well-registered number, to a list that genuinely knows you — the shared-shortener risk is smaller, and a branded domain is a nice-to-have rather than a fire. Be honest with yourself about where you sit. The senders who must fix this are the ones running recurring bulk campaigns: ecommerce blasts, agency client sends, anything at scale where a few percentage points of silent filtering compounds into real lost revenue every month.
The practical takeaway
Public shorteners fail for a boring, mechanical reason: carriers score the domain, and a shared domain carries everyone's reputation, spammers included. You inherit that with no warning and no bounce.
The fix is cheap and durable:
- Register a short branded domain (~$10–$40/year), ideally on your real brand.
- Route your shortened links through it.
- Keep the rest of the stack clean — registered 10DLC, a dedicated number, real opt-in, low complaints.
- Give the domain a couple of weeks of clean sending to season.
Then watch whether "delivered" and "clicked" start to converge. If you're weighing the whole switch, our reduce SMS costs guide and the pricing page are the next honest reads — no rush, no hard sell. The domain fix is worth doing whether or not you ever send through us.