How to Add Auto-Increment Custom Field to List

[dobriyalji]

Hi Team,
I want to add auto-increment Custom Field to List.

If i add subscribers email to list then it will auto-provide increment number respective to the particular email...

Example shows below:

EMAIL	Auto- Increment-Score-Field
abc@gmail.com	1
def@gmail.com	2
ghi@gmail.com	3

 

[twisted1919]

We don't have this ability