If you are you are getting an hourly limit exceeded error while sending an email. Please upgrade your plan after login your Readyspace clinet area.
The customer login link is given below
https://cloud.readyspace.com.sg/knowledgebase/article/8/customer-login-links/
NB: The main packages email per hour limit are given below:
Web app basic - 200 hourly limit
web app free - 50
web app plus - 500
webspace pro - 500
office mail 15 - 500
office mail 3 - 500
office mail 40 - 500
office mail 8 - 500
office mail 300 - 500