# How do I setup double Opt-In for subscribers?

Double Opt-In can be enabled for all subscribers that sign up to Mailblast either via the Sign Up form or the API.

You can enable double opt-in and configure the verification email that goes out to your subscriber, from your the List Settings section in your account config.

![](https://3747798111-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOLiZFb8QcPSjvrne1vkm%2Fuploads%2FjZUWIUc4UoGBsOp8dovi%2Fdouble-opt-in1.png?alt=media\&token=bc0f244c-af1e-4171-977f-fee88ac0f897)


---

# 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.mailblast.io/using-mailblast/how-do-i-setup-double-opt-in-for-subscribers.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.