Hi there,
That happens because we don’t allow too many subscriptions with the same IP address for logged out users. It means the more times you try to subscribe – the longer you have to wait for subscribe again.
It’s actually the expected behavior to avoid spammy subscriptions in a short amount of time. If you have different users trying to subscribe (using their own IP addresses), they won’t get this error message.
You can read more about this here: https://kb.mailpoet.com/article/271-error-messages-when-subscribing
