The pulse and alert don't work


#1

I set a pulse of some question,and test “send email now” then can recieve a email about the question.
But can’t recieve the mail next time any more .
I have checked the data and dashboard, no matter i set or not set the “Skip if no results” ,but no email.
I also checked the log ,and find no record.
Is there some settings set wrong or others reason?