Checking for duplicate emails automatically before launching automation

Im creating a outreach machine in and the last issue I am running into is figuring out a way to stop a Item from entering the automation if a item with the same email is already going through it. I have a database set up that copies every item that goes into it and before the item goes into the automation I want it to cross check the database to make sure emails have not already been sent to the email on file. Does anyone have an Idea on how I can accomplish this?

Hello @camdaty14!

Can you specify how the process works? Where is this data base? What is the trigger of the automation? What is the action of the automation? Are you using a script? What does the script do?