Start Free Trial

Double Opt In - When your opt in needs confirmation

Confirmation message responses can:

  • Respond to external application triggers
  • Confirm device address (Mobile Phone Number)
  • Help you better serve your customers
  • Provide valuable feedback

Sire Advantages

  • Natural language processing (NLP)
  • Advanced Branch Logic
  • Template Ideas for your business
  • Not just fire and forget - advanced Session flows
  • Automatically add confirmed SMS phone numbers to your list
  • Automated template customization based on your Organization's profile settings
  • No App required! Works great on phone and tablets browsers too.
  • Still simple to use

How Double Opt-In Works

Typically, a visitor to a web site that offers a newsletter or other reoccuring content will insert their SMS mobile phone number in a form and click a button to subscribe. This is their first opting in.

The site then sends a one-time confirmation SMS to the SMS mobile phone number entered asking the user to, in turn, confirm the SMS mobile phone number. The new subscriber follows the directions in the SMS or replies to the message. This is the second opt-in.

Only after this confirmation is the SMS phone number added to the newsletter, transactional list or marketing distribution list.

Of course, the initial opting in can also happen via a Keyword request. Keyword opt in or (Single Opt In) is usually good enough for a single request, but the double opt in verifies the SMS Phone number wishes to recieve additional messages in the future. Also entries in web forms and via other channels like the phone need to use double opt in to confirm both the SMS phone number and the user's intent.

Double Opt In Template

GS Alert: You've chosen to receive SMART Project msgs. Reply YES to confirm, HELP for help or STOP to cancel. Up to 5 msg/mo. Msg&Data rates may apply

GS Alert: You have sent an invalid response. Please call us at 999-999-9999 for assistance.

GS Alert: Registration for SMART Project text alerts is complete. Reply HELP for help or STOP to cancel.

Subscriber list: The Smart Shoppers Club

What makes a good double opt in confirmation message?

By customizing your confirmation message, you provide your subscribers with a message they recognize and understand, two factors that increase the likelihood that they will take that one step to respond to the message. We provide the option to customize the initial question of the confirmation message, as well as the confirmation response and closing. This knowledge base article is meant to cover what should be written in the message.

Who Is the Message Coming From?

You want to make sure that it is clear who the confirmation message is from so that the new subscriber knows that the sender can be trusted. Whether the message is from your company, your website, or you personally, the important thing will be that your subscribers will recognize the sender.

Why Was the Message Sent?

This may seem redundant, but you want to make it very clear why you are sending this confirmation message could be as simple as someone just signed up for your SMS list. It's very important here to make the connection between their initial subscription and the confirmation message.

What Needs to Be Done With the Message?

Finally, you need to make it clear that something needs to be done with the message - that confirmation needs to be sent as a reply. This ensures that the message isn't simply ignored or set aside for later and forgotten.




1. used to give an affirmative response.
"“Do you understand?” “Yes.”"
synonyms: all right, very well, of course, by all means, sure, certainly, absolutely, indeed, right, affirmative, in the affirmative, agreed, roger; aye aye; informalyeah, yep, yup, ya, uh-huh, okay, OK, okey-dokey, okey-doke; archaicyea, aye
  • an instance of this.

    "yes, I'll come to your party"

Natural language processing (NLP)

Natural language processing (NLP) is a field of computer science, artificial intelligence, and computational linguistics concerned with the interactions between computers and human (natural) languages. As such, NLP is related to the area of human–computer interaction. Many challenges in NLP involve natural language understanding, that is, enabling computers to derive meaning from human or natural language input, and others involve natural language generation.


How Sire makes this task easier for you

Natural human language responses accepted

Partial List of Acceptable Responses

Millions of ways a target user can respond






"I would like to join the club."

"Roger Dodger!"

"Okey Dokey"

Computer Geeks