I was then thinking that maybe some of my emails don't reach its destination. Is it really possible that some emails sent do not reach to their intended destined emails? There are times I received a "returned email" status or notice, and that my email couldn't be forwarded, but I was worried that maybe even without notice still some of my sent emails do not really go to their destination inboxes. I use Yahoo Mail. Is there anyway to make sure our sent emails could go where it was be destined to go?