Option for double opt-in

I have added a release with this new feature.

Works great. I think for the double opt-in option the handler should output a different message. It currently prints 'The email address %email was subscribed successfully to %list'. Perhaps it could print 'To complete your subscription to %list please check %email for a confirmation email'. Unless there is already a way to override the handler message in the webform settings?

We can tackle this in a separate issue. I have opened Issue #3474610: Feature: make confirmation message customizable ✨ Feature: make confirmation message customizable Needs work .

Meanwhile, here is a solution you can use:

1. Enable Core’s Interface Translation module
2. Go to /admin/config/regional/language/edit/en and check “Enable interface translation to English”
3. Go to /admin/config/regional/translate
4. Search for the message and change it.

Automatically closed - issue fixed for 2 weeks with no activity.