Double opt-in

What is double opt-in?

Double opt-in is a sign-up process where a person confirms their consent a second time before they're added to a list. After the first step, such as submitting an email address, they get a confirmation message, most often an email with a link to click. Only after they confirm are they added. It's also called confirmed opt-in.

The alternative is single opt-in, where the first action is enough. Both are common, and many email tools let the list owner choose.

How does it work?

For email, double opt-in usually runs like this:

1. The person enters their email address on a form or in a sign-up flow.
2. The email tool sends a message asking them to confirm.
3. They click the confirmation link.
4. They're added to the list, often with a welcome email.

Texting has a similar pattern, where someone signs up and is asked to reply to confirm before they get more messages.

The case for double opt-in is list quality. A mistyped address never confirms, so it never joins the list, and neither does an address someone entered for a friend as a joke. The confirmation also gives the list owner a clear record that the person agreed, with a time stamp.

The cost is that some people never confirm. The confirmation email arrives later, sometimes lands in a spam or promotions folder, and competes with everything else in the inbox. Every person who doesn't click is someone who wanted to join and didn't.

Whether double opt-in is expected or required depends on the country, the channel, and what you'll send. Ask a lawyer about your own situation.

Why it matters at live events

The gap between steps is the problem at live events. A person who texts in after a keynote is interested right then. The confirmation email arrives while they're walking to the next session or driving home from the show, and the interest has cooled. Single opt-in captures the moment; double opt-in asks them to come back to it.

There are ways to keep list quality without a second step. Checking each answer as it's entered catches most typos. In a Textiful flow, an answer that doesn't look right, like an email missing its @, gets a retry on the spot. Delivering what you promised right away (the slides, the handout) also gives people a reason to have entered a real address.

If your list uses double opt-in in your email service provider, check how that tool treats contacts that arrive through an integration, so you know whether event sign-ups will get a confirmation email. See integrations for what Textiful connects to.

Key takeaways

• Double opt-in asks people to confirm their sign-up a second time before they join.
• It improves list quality and gives a clearer record of consent.
• Some people never confirm, and at live events the delay between steps is costly.
• Checking answers as they're entered is another way to catch bad addresses.

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