@mgotao
You can use the same technique used to send reminder emails for approvals.
See my example below.
In my example, I declare a variable and set it to an initial value of 0. Immediately after a response is received from the email, I set the value to 1.
In a parallel action, I have a loop that waits a specified period of time - any period of time you want. Then I check to see if the value of the variable is still 0. If so, I send an email. If not, I loop and wait again. The loop will continue until the variable is equal to 1.


If this addresses your issue, please mark your post as Solved.
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Scott