Thank you for reaching out to us. We understand how important it is to comply with industry regulations.
Since we primarily deal with email marketing, email addresses are a requirement for all contacts uploaded into our system. Whether they're added through a file, singularly, or via a sign-up form, email addresses are a must.
Email addresses are what also determine a unique contact, that way our billing can be as streamlined and accurate as possible, and to ensure that campaigns are being sent out in an orderly fashion.
You could potentially utilize a sign-up form from outside of our system, but we would not be able to import email-less contacts into your account.
If you have any additional questions or concerns, feel free to reply to this thread or create a new one, and we'd be happy to assist.