Dear All i have a problem when sending my email. After i send my email, an email come from system administrator and the message come like this. Your message did not reach some or all of the intended recipients subject : bla bla bala sent : date the following recipient(s) could not be reach abc on date could not deliver the message in the time lumut speviied. Please retry or cantack your administrator <mail.mydomain.com #4.4.7> Please help me.... ps: I guest its because the foloowing recipients mailbox is fuel. is it become the reason?