The ability to set the condition "Marketing email not sent" in list and workflow
Currently, the only way to pull up a list of contacts if marketing email not sent is to create two lists - the first one being marketing email sent and the second being contact is not a member of the first list.
This actually creates extra work on the customer's end. Also, it'd be good to allow this ability to set "marketing email not sent" so as to allow multiple forms submissions follow-up emails to be set up in one workflow. So that we can set and if/then branch > if customer has filled up form A and not received email follow up A, send them down to Yes branch.