Multiple standard campaign in single list issues

[alvitazwar]

Issue details:
When user send multiple campaign using single list then this problem arise. If user send campaign_one with send now mode and schedule campaign_two after times later and within this campaign_one sent duration any user unsubscribe from the list then on the campaign_two the email should not send to the unsubscribed user. BTW, User get the email even after unsubscribe from the list.