Mail Outgoing blocked. Reason :Mail rate exceeded limit

Mail Outgoing blocked. Reason :Mail rate exceeded limit

Hi Admin

i just got an email that outgoing has been blocked , but email id just created 1 hour ago and i just only sent 4-5 emails , i know why is the reason said " Mail rate exceeded limit"

Please fix this issue , my email id ravinder.n@mediatrenz.com 

regards
Mediatrenz