How to prevent multiple form submission

We have a newsletter sign-up form. But user can sign-up several times. I want to display the message “You are already registered” to the user who has registered before.

This would be a really good addition to the Forms.

A checkbox that we could select that would prevent a customer from filling out a form mulitple times would greatly help us!

this is absolutely needed!

+1 vote - or perhaps using lists to create an exclusion/inclusion list could be a neat way to prevent multiple entries or submissions from emails not ‘invited’ to an event, etc.

Really need this! We want to run competitions through HubSpot forms and only allow 1 vote per email address.

NEED this feature! Just a simple check box in the settings to disallow multiple submissions would be incredibly helpful.

This would be a great feature as we have this issue constantly with certain forms

Would be an awesome feature. Just Upvoted this to see if the prod team would put priortize this on a roadmap!

THIS IS WHAT WE NEED. INSHALLLAH!!!

This is an required feature for prevent user submitting multiple entries.

We need this too. In my case, we want to ask a few questions in the form, process the answers in a workflow, and initiate an action based on the customer’s answers.
So, we really like to be able to limit submissions.
It’ll be helpful to be able to put form submission in a queue in workflows. Let’s wait to process the first submission, and after finishing this workflow restart it for new submitted properties. I am doing this with a few flags to avoid mid-workflow process property updates.