Hi @mariamarketing ,
Good question!
I would recommend that you create a form where someone can indicate their preferences. That way someone can also sign up for two industries, for example.
You can then share this form with the people who are already on the list by e-mail. If the form submission uses an email address already associated with a contact record, or if the submission is done in a browser with tracking cookies tied to an existing contact record, it will update the existing contact record and not create a new one.
When a visitor arrives at the HubSpot form, HubSpot checks the visitor’s browser for tracking cookies. If this cookie is associated to a contact, HubSpot pre-populates fields on the HubSpot form with known values by pulling the information from their record. So if these contacts have accepted cookie tracking on your website or previously submitted a form, they don’t even need to fill out their email themselves.
Hope this helps!
Kind regards,
Kim