You can now filter out waitlist messages from your inbox. Just de-select the Transactional message type from your Filters Menu. To see this menu, click Home > Inbox > Filters.

Control when your waitlist requests will start firing to customers via Settings > Waitlist settings > Additional Settings > Uptime settings.

Note that if you have 'fastest fingers first' or 'double opt-in' as your waitlist option, no one will receive messages in the off hours that you set.