Double Opt-In Signup Form FAQ's

MailChimp's double-opt-in signup forms make it easy to grow your list. After a new subscriber fills out your signup form, we'll send them a follow-up email with a link to confirm their subscription to your list.

In this article, we'll answer common questions about the double opt-in process.

About Double Opt-In

MailChimp recommends a double opt-in signup form as the best way to build your list. In this section, we'll answer common questions about double opt-in requirements.

Is double opt-in required for signup forms?

Most standard MailChimp forms require double opt-in. This includes:

  • Hosted signup form
  • Embedded signup form
  • Facebook signup form

Our Subscriber pop-up form allows you to use either a single opt-in or double opt-in form.

About Double Opt-In


Why double opt-in?

Double-opt requires new subscribers to confirm their signup, so you know they want to receive emails from you. Double opt-in lists have better subscriber engagement levels over time. This means more opens and clicks, and fewer bounces and unsubscribes. Double opt-in also safeguards your account against malicious spambots and scammers.

How the Form Builder Works


Do I have to use double opt in?

Yes, if you use our signup forms. Double opt-in isn't mandatory for these other methods, as long as you have express and verifiable permission to email your subscribers, but we still recommend it.

  • Subscriber pop-up form
    Embed a pop-up form on your website to quickly add site visitors to your MailChimp list.
  • List import
    Add a list of contacts directly to MailChimp, or add them one at a time.
  • Single opt-in signup forms
    Create your own single opt-in signup form with an integration. Certain integrations like Wufoo and List Subscribe for WordPress will will let you switch to single opt-in.
  • E-commerce customer sync
    Sync customers from your online store to your MailChimp list with one of our e-commerce integrations.
  • MailChimp API forms
    Add single opt-in list members with the API.

Import Subscribers to a List
How to Use MailChimp for E-Commerce

Manage Subscribers with the MailChimp API 

Add a Pop-Up Signup Form to Your Website


I already have a list of people I want to add to MailChimp. Can I do this?

Yes. You can import contacts directly to your MailChimp list, add subscribers one at a time, or use an integration to add contacts from another service. We trust that your contacts have opted in to receive your campaigns. However, you should never import stale lists, purchased lists, or other noncompliant lists because they can cause problems in your account.  


Do subscribers added through a list import receive a signup confirmation email, or a final welcome email?

No, because list imports are a single opt-in process. Subscribers added via import won't receive our opt-in confirmation email or the final welcome email.


Can I connect my double opt-in signup form to more than one list?

No. A signup form can connect to one MailChimp list only. In some cases, you can alter your form with the API to submit data to multiple lists, but this requires coding expertise.

Customize Your Double Opt-In Process

The double opt-in process features a few forms, emails, and pages, which you can edit to match your needs and brand. In this section, we'll answer common questions about customizing the double opt-in process.


Which signup form should I use for my double opt-in?

We have a several different double opt-in signup form types, and you can try different options out to see what's best for you. You can even use multiple form types for one mailing list. We recommend starting with the simple hosted signup form and moving on to other form types later.

About Signup Form Options


Where do I view my double opt-in signup forms and response emails?

They're stored in the Form Builder for each list in your account.


What does the double opt-in process look like?

Your subscriber will fill out your signup form, log into their email account, and confirm their subscription in our opt-in confirmation email.


What can I customize besides the signup form?

The signup form with alerts, signup thank you page, opt-in confirmation email, confirmation thank you page, and the optional final welcome email.


Can I use the double opt-in process to trigger an automation?

Yes. You can use automation to send subscribers a welcome message after signup, instead of using our standard welcome email.

About Automation

Can I send coupons or offers to new subscribers during the double opt-in process?

Absolutely. Send a file to your new subscribers right after they sign up.

Send a File to New Subscribers

Troubleshoot Double Opt-In

In this section, we'll answer common questions about issues you might encounter with double opt-in emails.

Why aren't subscribers receiving the opt-in confirmation email?

If your signup form was filled out correctly, the opt-in confirmation email is on the way to your new subscriber's inbox. There are some factors like server issues or firewalls that can delay delivery, so we recommend allowing up to 24 hours to receive the confirmation email.

Troubleshoot the Opt-In Confirmation Email


Why aren't my new subscribers receiving the final welcome email?

The final welcome email is disabled by default, so it won't be delivered to new subscribers unless you enable it. As long as the final welcome email is enabled, subscribers who come from your signup form will receive it after they confirm subscription. If subscribers are added to your list through a single opt-in method like a list import, e-commerce integration, or the API, they won't receive the final welcome email.

Enable or Disable the Final Welcome Email

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