Hi @sunilshah, 

Welcome to the Community, we are so glad you’re here! 

Unfortunately, you cannot segment off of whether or not someone has been in a Flow at this time.

A potential workaround I would suggest is creating a segment off of all the Subject lines in your specific Flow emails . The segment will be created by adding What Someone Has Done > Received email > At least Once over All Time > Where Subject Line Equals _____ ( enter all of your subject lines for each flow message) AND Has Received email > Zero Times > Over All Time > Where Campaign name equals > _____ (enter all of your campaign names that you have sent out so far).

I suggest using the AND connector in this segment to ensure this segment is exclusive, meaning a user has to meet each segment criteria to be dynamically pulled into this segment. 

For additional information on segments, I’d check out some of our documentation and have a look around the Community!

• Understanding Segment Conditions

Thanks for being a part of the Community! 

-Taylor 

Thanks for this! You say “(enter all of your subject lines for each flow message)” — can I add multiple subject lines at one time in that single filter, or do I have to create a ton of different OR “What Someone Has Done > Received email > At least Once over All Time > Where Subject Line Equals _____ “ over and over again, like in the screenshot below? Thanks!

Hey @escottberg 

Thanks for the followup question. You will need to use a new OR definition for each “subject line” you want to filter by. Putting it all in one line would be read as one “subject line” and would return 0 results.

Hope this helps!