How to prevent multiple form submission

[itopac]

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.

[alexiameyer20]

This would be a really good addition to the Forms. 

[HillaryThompson]

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

[Alexrott]

this is absolutely needed!

[JGB]

+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.

[CW74]

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

[TBLevy]

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

[OliviaL]

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

[echo1]

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

[MMichalski]

THIS IS WHAT WE NEED. INSHALLLAH!!!

[MubarakM]

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