Asking your new sign-ups to confirm their interest with a "double opt-in" isn't required, but it's the strictest way to obtain consent to send your emails. It may be an option that's right for you because it gives you high confidence that the person who subscribes really wants to receive your emails.

The form allows for minimal styling with custom CSS classes by clicking Contact Form > Settings > Global Form CSS Settings, but inherits as much as it can from the theme you're using on your website. If you don't like the look of your form, a front-end developer with CSS knowledge can review your site to determine if any CSS style rules are interfering with your form. For further help, you can visit the Support forum.
When the opt-in box is on your sign-up form, your contacts must check the box to be added to your list. If the box is unchecked, it won't prevent your contact from submitting the form, but that contact won't be added to your list.
| Did you know? Contacts who join your list through the WordPress Forms plugin, are all automatically documented as having given express consent. To see the contacts who have given express consent, make sure you've enabled advanced email permissions in your account. |
Copyright © 2026 · All Rights Reserved · Constant Contact · Privacy Center