How can I check the last time someone logged into their yahoo email?

I sent a message to someone a few days ago and am wondering if they got my message or not. I have yahoo email and so does the person I sent the message to. I am wondering how can you tell the last time they logged in? I just want to know if they read my message or not or if it was sent to their spam folder or what because they have not responded to me or anything. Any help? Is there a way to tell their last log in time and date by their yahoo email?