Check forms for missing details, return them for correction. Every one is ready to run, and you can adjust it in plain language.
Keep the launch waitlist clear about who has confirmed their email.
Know which waitlist emails are confirmed. Your shared sheet shows signup details and verification status. People with invalid codes get another try.
Send a daily report of rejected signups for list review.
Your welcome queue gets confirmed signup addresses, while a daily report shows you which signups need review.