Database clean-up: Email Invalid
I have a Smart list of over 80K leads that are marked as Email Invalid- these are taking up space in our database.
I am trying to run a campaign to:
1. Remove their invalid email from the email address field
2. Remove them from Marketo, not SalesForce.
Ideally, I would like the Sales and Client Service team to find the proper email address, fill it in and re-sync to Marketo.
I have tried to set up a Smart Campaign that would NULL out the email address but that did not clear the email address. Below is the Flow that I put together.
The smart list will be anyone that is on the Email Invalid Smart List that I created.

Any suggestions would be greatly appreciated.