text: 0x800CC70 is Relaying Prohibited error. Try this : \nOpen Outlook Express, and \nTools > Accounts\nClick on Mail tab\nSelect your email account that is giving you the problems. \nClick on Properties\nClick on Servers tab\nUnder the Outgoing Mail Server frame, make sure that My Server require authentication is enabled. \nClick on Settings under it\nSelect Logon using the same settings as my incoming server. \nClick on OK\nClick on Apply\n\nNow try sending.