# Email with OTP

This allows your viewers to login by entering their email and an OTP. You can also whitelist the domains you want to allow, or directly select most commonly used email domains like gmail.com/outlook.com etc.

To authenticate your deployment with the Email with OTP option, you first need to create a [Viewer Group](/metaverse/sdk/gmetri-sdk-apis/viewer-group.md) (steps below). And then select that viewer group as the access method for the deployment in question.<br>

## Creating a Viewer Group for "Email with OTP"

<figure><img src="/files/hBODz4Wcxv0uqHwK7ron" alt="viewer groups page"><figcaption><p>Creating a Viewer Group for Email with OTP</p></figcaption></figure>

### Types of Filters

<figure><img src="/files/SsxROO8wPjV0ODVczqPq" alt=""><figcaption><p>Types for filters for Email with OTP Viewer Group</p></figcaption></figure>

* Public - allows all emails
* Filter by domain - you can provide a comma separated list of email domains you want to allow (eg: `walmart.com, google.com` )
* Common Email Domains - allows most of the common email domains, while ensuring that disposable email domains aren't allowed.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.gmetri.com/metaverse/publishing/authentication/email-with-otp.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.