I can not send Email from SQL Server 2005

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C#

VB

ASP.NET

SQL-Server

database

Hi guys,

I want to send Email from SQL Server 2005,
I create Profile and Account by using SQL Server Management,
I used this Stored Procedure:

EXEC msdb.dbo.sp_send_dbmail
				@profile_name = 'MyProfileName',
				@recipients = 'MyEmail@hotmail.com',
				@subject = 'New Islamic Topics',
				@body_format = 'HTML',    
				@body = 'Welcome in my Website.';

every thing is work nice and this message appear 'Mail queued.' when run the Procedure msdb.dbo.sp_send_dbmail,

but the Email not received when i open my email nor in Junk mail,

I try every thing but no way, this the error message from log:

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 4 (2012-10-09T09:09:03). Exception Message: Cannot send mails to mail server. (The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at).