What is 'Group Messages' in ProductHunt Ship?

I set up a ProductHunt upcoming page to keep track of my subscribers, and I noticed there's a message feature that lets me quickly send emails to my subscribers. However, it says the following on the 'email to' section ``` With Group Messages, you can quickly filter and target your subscribers with Messages. "Group Messages" is available on the Pro ⭐️ and Super Pro 🌟 plan. ``` Does this mean I am still able to send email to ALL my subscribers if I click 'send' at the bottom, or do I need pro/super pro plan for this feature? I am too scared to click the send button on bottom because if it works that means it sends my test emails to all of my subscribers.