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My question is diff. I understand that it will check duplicate if I am sending to multiple list at same time. However I want to know will it check if I send same mail to diff list on diff days
I just checked your original thread and it seemed you've edited it. So now I understand you basically want to send an email to a list in one day and send another email to another list on another day.
But you want the second email to not send to those who have already been sent to on the first list.
That's not possible. Only when you send a newsletter to multiple lists will Sendy check if an email exists in these list and only send once if so.