Outgoing eMail Blocked - Immediate help needed.

Outgoing eMail Blocked - Immediate help needed.

Today, I noticed that my outgoing email has been blocked. Please let me know the sending limit per minute. So, that I can be within limit. I am using comment notification plugin in wordpress, which probably crossed the limit. I am deleting user's subscription to "Reply Only" to avoid such crossing limit in future.
PLEASE UNBLOCK ME.
Thanks.