On one of my site, the conformation mail sends directly to the new member.And also in the rigt non spam inbox at yahoo.

But on my other site, the conformation mail sends after 30-60 minutes? and the same with the reply mail after a moderator has said ok to the new member.
Alsp thr mail send to the spam inbox in yahoo?? How come?

Is there a way to set the time for this mail to send and to avoid to get in the spam inbox?