# About Postman
Postman is a mass messaging tool for the Singapore Government. These messages can be sent via our web app directly (see [campaign guide](https://guide.postman.gov.sg/campaign-guide/before-you-start)) or via API integration (see [API guide](https://guide.postman.gov.sg/api-guide/overview)).
We've sent out more than 100 million messages from over 90 agencies. These include quarantine orders, COVID-19 test results, and employer notices.
Start using Postman by logging in with your `@agency.gov.sg` email address!
## What can Postman Web App do?
* **Easily customize messages to reach a wide audience**: Create a message template, upload a file containing customization parameters, and we will handle the rest for you.
* **Mass send emails**: Just click `Send campaign` and Postman will send those messages out to your intended audience via email.
* **Mass send SMSes**: Enter your Twilio credentials under `Settings`, and Postman will send those messages via SMS. No integration with Twilio is needed.
* **View stats**: Keep track of your campaign's progress as it is sending and check back when it is completed.
* **Scheduled sending**: Create your campaign but send it out at a later **time**.
## What can Postman API do?
We provide a **modern, cost-effective, and compliant PaaS** for government agencies to send programmatic emails and messages. Head over to the [API guide](https://guide.postman.gov.sg/api-guide/overview) to find out more.
## Is Postman secure?
Emails, SMSes and Telegram messages are not 100% secure. Users should be wary of putting sensitive information directly in your message body. Depending on the level of sensitivity, users can consider using recipient-specific, high-entropy links or requiring further authentication to see sensitive information.
## Can Postman be accessed on the government intranet?
The Postman web app can be accessed on GSIBs that allows Secure Internet Surfing.
## What data can Postman handle?
We use cloud infrastructure so we can handle up to **Confidential (Cloud-Eligible)** data. For more information, you may refer to the section of our guide on [IM8 Policies](https://postman-v1.guides.gov.sg/~/changes/YeLkNyuQOW0qmXU37t7T/email-api-guide/overview/im8-policies) (`.gov.sg` login required).
| Normal email/SMS | Non-sensitive to sensitivity low-normal | - Transaction
- Notification
- Information broadcast
- Receipts
- Reminders
|
| ------------------------ | --------------------------------------- | ------------------------------------------------------------------------------------------------------------------- |
| Password-protected email | Sensitivity high/restricted | - COVID-19 test result
- Blood test result
- Exam test result
|
## Difference between the Web App and Programmatic APIs
**Web App:** Users can access Postman by going to . The web app has a user interface that allows users to send templated messages via campaigns.
**Programmatic APIs**: Users who manage their own systems could also call our APIs to send messages programmatically. In order to use this feature, you need to generate an API key from `Settings` in the Postman web app. You can find more by going to our API Guide [here](https://guide.postman.gov.sg/api-guide/overview).
| Access Type | Channels | Type of Use Case | Prerequisite |
| ------------------------------------------------------------------------------ | ---------------------------- | ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Web app](https://guide.postman.gov.sg/campaign-guide/quick-start) | Email, SMS, and Telegram Bot | Manual intervention required | @agency.gov.sg email access to log in
You will need to request for a @agency.gov.sg email address from your respective agency if you do not have one.
|
| [API](https://github.com/opengovsg/postmangovsg/blob/master/docs/api-usage.md) | Email & SMS | System-generated | Engineering or IT team to send messaging info from the source system to Postman. |
## Open-source contribution
Postman is open-sourced. Visit our [GitHub repo](https://github.com/opengovsg/postmangovsg) to start contributing to our code. Contributing guidelines can be found [here](https://github.com/opengovsg/postmangovsg/blob/master/docs/CONTRIBUTING.md).
