Delivery Receipt, the status update confirming whether a sent message actually reached the handset, was queued, or failed.
Why DLR Matters
Sending a message and knowing whether it arrived are two different guarantees. A DLR is what closes that loop, and it is what most billing, retry, and compliance logic in a messaging platform is built around.
How DLR Works
After a submit_sm, the SMSC tracks the message through the network and, once it reaches a final or intermediate state, sends a deliver_sm back to the ESME carrying that status: delivered, failed, expired, or undeliverable, along with a reason code where available.
How SMPPCenter Uses This
SMPPCenter reports DLRs back to you in real time via SMPP deliver_sm, or via a webhook callback if you integrate over the REST API, so your system always knows the true delivery state of every message.
Read More
Related Terms
Client Feedback
What Our Clients Say
Our clients run regulated, high-volume messaging infrastructure and prefer not to be named publicly. These testimonials are shared with permission while keeping commercially sensitive details confidential.
We needed complete control over our messaging infrastructure instead of relying on a hosted provider. The platform has delivered excellent performance and reliability.
The migration was completed smoothly and the platform has remained stable under heavy production traffic. The flexibility of self-hosting was one of the biggest advantages for us.
We evaluated several messaging platforms before selecting SMPP Center. The deployment flexibility and API capabilities matched our enterprise requirements.
High throughput, intelligent routing, and detailed monitoring have significantly simplified our messaging operations.
Names and company details are withheld at our clients' request. This is common among telecom providers, SMS aggregators, fintech companies, and enterprises that consider their messaging infrastructure commercially sensitive.