Double opt-in means a new subscriber confirms by email before joining your list. It keeps typos and fake addresses out, gives you cleaner engagement data, and leaves a record of consent. ChimpMatic supports it with every provider. However, each platform handles confirmation a little differently, so here is how it works for each one.
How each provider handles double opt-in
Mailchimp: per form, your choice
You choose single or double opt-in right in the form’s Chimpmatic tab. With double, Mailchimp sends its confirmation email, and the subscriber joins the audience only after clicking it. With single, they join at once. Different forms can also use different settings. Mailchimp setup guide
Brevo: direct subscribe or confirmation email
For each form, you either subscribe contacts directly or have Brevo send its confirmation email first. You manage the confirmation template inside your Brevo account. Brevo setup guide
MailerLite: follows your account setting
MailerLite controls double opt-in for the whole account. So when you turn it on in your MailerLite settings, subscribers from your forms get a confirmation email. When you turn it off, they join right away. MailerLite setup guide
Klaviyo: follows the selected list
Klaviyo sets opt-in per list. If the list you picked uses double opt-in, new profiles get a confirmation email before they subscribe. Otherwise, they subscribe as soon as the form is sent. Klaviyo setup guide
Campaign Monitor: follows the list type
Every Campaign Monitor list is either single opt-in or confirmed opt-in. Confirmed lists email a link first, while single lists add people at once. You can switch a list’s type at any time, as Campaign Monitor explains. Campaign Monitor setup guide
GetResponse: follows the list settings
GetResponse applies the opt-in settings of the list you picked. When confirmation is on, the contact appears in the list only after clicking the link. GetResponse setup guide
EmailOctopus: a switch on each list
EmailOctopus lists use single opt-in by default. Once you turn on confirmation for a list, new contacts stay pending until they confirm, and ChimpMatic reports them as pending too. EmailOctopus setup guide
Moosend: follows the list settings
Each Moosend list can use single, soft double or strong double opt-in, and Moosend sends its own confirmation email. With soft double opt-in, people join either way, while strong double opt-in counts only confirmed subscribers. Moosend setup guide
Single or double opt-in: which should you use?
Choose confirmation when list quality and provable consent matter more than raw signups. That covers newsletters, lead nurture and anything under GDPR-style consent rules. On the other hand, single opt-in suits forms where the subscription comes second, such as a quote request. In that case, the extra confirmation step can cost you real contacts.
Either way, pair it with a clear consent checkbox. ChimpMatic can require that checkbox before it sends any subscriber data at all.
Test your double opt-in flow
- First, set up the form and submit a test entry with a real inbox you control.
- Then check that the provider’s confirmation email arrives and that its link works.
- Finally, look at the subscriber’s status before and after you confirm. It should show pending first, then subscribed.
FAQ
Why did the double opt-in email never arrive?
First, check the spam folder. Then check the sending domain and the confirmation template in the provider’s own settings, because the provider sends that email, not your WordPress site.
Can I customize the confirmation email?
Yes, in each provider’s dashboard. Mailchimp and Brevo let you edit the confirmation template, while the other providers set it on the list or in the account settings.
Does double opt-in change what data is sent?
No. ChimpMatic sends the same mapped fields either way, and the provider simply holds the subscriber as pending until they confirm. See external services for the full disclosure.
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