Solved it with:
Edit, I follwed the above link.
Instead of Count(MyFileMatch::TextField), found under point 3 next to MatchingRecords I wrote (MyFileMatch::Date).
It gives me correct count, but since I added the "Date field" today, I only have today as created in the latest records. The rest is empty.
So I can't decide until tomorrow if the function works.
Can you see based on the function if it will work?
I able to count matching email in all records, but I want to filter the count based on creation date.
You can include more than one pair of fields in your relationship. Use one pair to match email addresses, add a second pair to match by creation date. You can drag from email field to email field then drag from date field to date field to add both pairs of fields or you can double click the relationship line and add the additional pairs of fields there.