Form spam protection and SMS verification

HLB forms include built-in protection against fake submissions, using multiple security signals, plus protection against DDoS attacks. You can add more layers to help keep spam out of your CRM.

Spam matters most when a form triggers automated texts or emails. Fake contacts clutter your records and can raise your outreach costs, so blocking bad submissions early helps keep your marketing and sales data clean.

Ways to protect your forms:

• Captcha: add it from the form's custom fields to block large volumes of automated entries.
• Email and phone validation: help block temporary, invalid or fake contact details.
• SMS verification: confirm that a person can receive texts at the number they enter.

To set up SMS verification, first make sure a phone number is set up in your account settings. Then go to Sites, select Forms or Surveys, and create or open a form or survey in the builder. Add a Phone field if there isn't one, select it, and turn on Validate Phone in the field settings. Then preview, save and integrate the form or survey.

People filling in the form enter their number, select Verify Phone, and type the one-time code sent by text. The result appears in the submission data under Phone Verified. If someone does not complete verification, their number is not marked as verified. Verification texts are subject to applicable SMS charges.