In custom surveys the email address field is not auto populated. the more questions you add the lower the response rate hence I want this info to be pre-populated especially when I am setting it up on my website which is integrated with hubspot. I want the survey link so custom survey is the only option available, I can’t use other feedback surveys
Please make this available Hubspot team!
People don’t know what email address they are registered with in Hubspot, so asking them to provide their email address sets them up to give us the wrong information involuntarily through misspelling their email or entering an email address that is not linked to the users in our hubspot database.
Well now I feel stupid, and I think I have found a hack for this.
In your sharable link, inklude ?email={{contact_email}}, and it will be auto-populated.
Example, you have an automated email that goes out to the contact.
The link for the form is: Feedback Surveys
You can append ?email= and the contact property contact.email
Making the link look like this: https://survey.hsforms.com/12345fDJKDFNGORT59684?email=contact.email
Send out a test email to a contact with the email: hello@hello.com
And the link will look like this in their email: https://survey.hsforms.com/12345fDJKDFNGORT59684?email=hello@hello.com
And when they click the link, the email field will be populated with the email: hello@hello.com
Hope this works, as it did for me 
Thank you guys for sharing this!
Auto-populating web embedded surveys should also be available!
We are struggling because our survey appears after the check-out stage and in our website it is mandatory to log-in to make any purchase.
So basically, it’s not that reasonable that our customers log in to make a purchase (with their emails) and afterwards the survey cannot detect this information 
Please, if anyone has any hint on how to do this, we would really appreciate it!
Hubspot team, we count on you!!!