> For the complete documentation index, see [llms.txt](https://docs.localmail.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.localmail.io/messaging/smpp.md).

# SMPP Specification

Local Mail SMPP environment has multiple servers. To benefit from our fault tolerant, high availability platform we prefer SMPP customers to connect directly to our hostname. Based on location and traffic load your application will be automatically connected to the best server.

You should connect to Localmail SMPP servers using SMPP version 3.4.

Below are the connection details required to connect:

| **Setting** | **Value**                                          |
| ----------- | -------------------------------------------------- |
| IP address  | smpp.localmail.io                                  |
| Port        | 2999                                               |
| BIND TYPES  | Transmitter (TX)/ Receiver (RX)/ Transceiver (TRX) |
| system\_id  | your smpp username                                 |
| password    | your smpp password                                 |

{% hint style="info" %}
Throughput is tailored to each customer’s requirement during our onboarding process. In most cases for each bind connected to localmail SMPP servers you will be able to submit a maximum of 50 message per second. You can check with your account manager about specific requirements.
{% endhint %}

For relaying DLR back to your platform localmail servers will send back deliver\_sm to any bind connected with the same systemId of the originating submit\_sm PDU. This includes if you are sending from multiple sites; we will send to any active bind.

### Need More Help?

If u need any further Help During your Integration or questions related to technical know-how, you can reach out to our support team at **<support@localmail.io>**