I have created an autolaunched flow that based on criteria passed in decides which email alert (and email template) to use. The recipient is the Related Contact on the Case that triggered the process builder (and subsequently the flow) to execute. There is a Contact associated with the Case and the Contact has a valid email. The flow executes without error and the correct email alert is executed. However, the email is not received! This is in a sandbox - and yes, email deliverability is set to "All Email".
Is there some sort of a delay in sending the emails? I have received one, but I've tried so many things I don't know from which test it was!