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Original 2026-01-01

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1 Double opt-inis a confirmation process used in email and<a>SMS</a>marketing to make sure subscribers chose to receive your messages. After someone signs up for your list through your website, social media, or another marketing channel, they receive a confirmation email or SMS with a link. When they click on the link, their subscription to your<a>mailing list</a>is confirmed.

2 <h2>How to implement double opt-in</h2>

3 To implement a double opt-in process for your email or SMS marketing efforts, follow these steps:

4 <ol><li>Choose a reliable<a>marketing automation</a>platform:Make sure your platform allows you to toggle between double opt-in and single opt-in so you have a choice-but sets double opt-in as the default so you’re also always compliant. Your marketing automation platform should make SMS double opt-in with keywords particularly easy, as carriers often require it for certain types of messages.</li>

5 <li>Craft a compelling sign-up form:Design a simple sign-up form that can collect an email address or phone number, which will trigger the double opt-in message to confirm subscription. In regions where GDPR applies, an opt-in checkbox is also required.</li>

6 <li>Write your double opt-in message:Within your marketing automation platform, create your confirmation email. These messages include brand indicators that make it clear the email is coming from your business, a<a>call to action (CTA)</a>button to confirm the subscription, text that explains they subscribed to your list, and contact information for your business.</li>

7 <li>Specify a confirmation keyword:For SMS, specify a keyword that a recipient can reply with to confirm their subscription (usually “YES”). You’ll need to include this in your double opt-in message.</li>

8 </ol><h2>5 benefits of double opt-in</h2>

9 Using double opt-in benefits your business by:

10 <ol><li>Engaged subscribers:Double opt-in means only<a>engaged</a><a>subscribers</a>make it to your list, improving<a>open rates</a>, click rates, and conversions.</li>

11 <li>Ensuring compliance with regulations:Double opt-in helps you comply with regulations like<a>GDPR</a>and<a>CAN-SPAM</a></li>

12 <li>Reduced chances of<a>spam</a>complaints and<a>bounces</a>:Double opt-in verifies<a>email address</a>and<a>phone number</a>accuracy, which helps to make sure more of your messages are making it to inboxes.</li>

13 <li>Reducing fake and malicious sign-ups:With a single opt-in, anyone can enter any email address or phone number. Double opt-in verifies the legitimacy of each sign-up.</li>

14 <li>Building trust and credibility:A double opt-in process shows subscribers that you value their privacy and only send them relevant information. This builds trust and credibility with your<a>target market</a>, leading to long-term brand loyalty.</li>

15 </ol>A marketing automation platform like Klaviyo streamlines the double opt-in process for your email and<a>SMS marketing</a>efforts. With Klaviyo, you can create<a>customizable sign-up forms</a>with clear opt-in checkboxes, trigger automated confirmation messages, and follow up with personalized welcome emails or SMS.

16 <a>Sign up for Klaviyo</a>to simplify double opt-in, build stronger subscriber relationships, and get the most out of your email and SMS marketing initiatives.