Invalid Email in Logs - How to troubleshoot?

Invalid Email in Logs - How to troubleshoot?

Hi!

I have a couple of questions.

Problem:
I am getting errors in the logs for an invalid email address. And because of that error, the rest of the script seems like it stops.
 
Error details:
Error in executing On Add - On Success script.
Error.
Error in executing IF rule : Error in executing If block.
Error in executing IF rule : Error in executing If block.
Error in executing Send Mail task. InValid email Address Found.

Possible Solution:
1) how do i get the script to continue even if it finds an invalid email address?
2) How can I find the specific invalid email address?

Thanks!