I have configured a few rules in Qradar. I have tested the rules and they are creating offenses as expected. I have added email alert as a response to all the rules. There is no difference in the response configuration of the rules. But, only a couple of rules are sending email alerts and rest all are not. One rule that is generating email is event based and other one is flow based. So, it is nothing to do with the type either.
It would be really helpful if anyone can point out what may be wrong.