We're currently developing forms that submit a users basic details and mailing list preferences (3 options).
Upon submitting the form, the preferences are used to input the user's data into the relevant Sitefinity Mailing Lists. i.e. If I select all 3 options, my details are added to 3 mailing lists.
Currently, the form created does not recognise whether or not the details being submitted have already been added to the mailing list(s), meaning I can submit the same details as many times as I want.
I have 2 questions:
1. Does Sitefinity's e-mail campaign tool recognise duplicate email addresses, and thus prevent more than 1 email being sent to the same email address?
2. Is it possible to expand on the form function, so that upon submission values are validated and those already contained within a mailing list are recognised, and the user is notified that their details are already contained within the selected mailing list.