My account has reached its limit?

Hi, I just received a message that my account has reached it's limit (I was emailing - sending replies to the submissions we'd received).  Can you let me know what limit this is referring to?   Is there a limit to email or something?  Happy to upgrade to a paid account, but would like to understand first what is and is not included in the free account. :) 

Thanks,

Christa

Username: doulanetwork

Email: christa.buckland@live.com

Hello,

Right Now it looks like you have a free account and any paid plan will give you more and more option to improve your JotForm experience please feel free to check out our pricing plans 

Thank you for using JotForm

Let us know if you need any further assistance