Send third mail with a delay

Delayed delivery is not built into WordPress, nor CF7. This plugin does not change how mail is generated and delivered. To delay messages, you’d have to

1. Prevent a message from being sent.
2. Store it in its entirety somewhere along with info on when to deliver it.
3. Have a scheduled (cron) task to check for messages to send and send them.
4. Provide a visible log of delivery results to admins, because the feedback for non-delivery is no longer instant.

There may be a plugin that already does this, I don’t know. It’s not a basic feature to add.

Go to Contact > More mails, to set how many Mail sections you need per form, and save. There isn’t a limit, but this is really for unique messages. If you want many people to get the same message, use a Cc or Bcc header instead.