If you're not receiving Knit Camp verification emails, it could be that your Google Mail storage is full. If this is the case, the Knit Camp system will show that the email is undelivered. The reason is, that at some point the Google drive storage had reached capacity, and this meant that emails were bouncing as they were not allowed to be delivered.
We can reach out to Knit Camp app developers and have them remove the email address from our bounce list. The next step will then be for you to attempt to log in again and see if you receive the email.
If you still do not receive the email, try to follow these steps from Google to manage email storage as it will mean Google is still restricting this account from receiving the emails.