You need to enter the recipient's email in order to send invitation emails or get an invitation link. We designed it this way to prevent recipients from accidentally being inviting to their own AwesomeBox, and so that they can later get access to the digital version online.
However, if the recipient doesn't have an email address, how do you invite participants to collaborate?
A workaround for Gmail or G Suite users, we suggest you modify your current email address by putting dots (".") anywhere in the address. Gmail ignores periods as characters in addresses. For example, you could tell people your address was firstname.lastname@example.org, email@example.com or firstname.lastname@example.org. All of these will still be delivered to email@example.com, but AwesomeBox.com will treat it as a different user, which you can give the recipient's name.
For other types of emails (e.g. iCloud/me.com), you can usually create an "alias" which will work similarly as described above.