I can not send Email from SQL Server !!!!

Hi every body,

I have big problem at least for me, i want to send an Email using SQL Server 2008,

this message appear: "  Mail queued. "

but this error message appear is the Database Mail Log:

The SMTP server requires a secure connection or the client was not authenticated. 

I make all steps right like this link:

Please do not tell me that: "You must do some thing wrong"  no

I am sure that every thing and all steps is right,

I reinstalled new version of windows and SQL Server 2008 but the problem is still,

i tried with SQL Server 2005 but also the same problem:

The SMTP server requires a secure connection or the client was not authenticated. 

The Firewall is turning off and i am also close my Antivirus but also no way,

I am also try with microsoft:

Troubleshooting Database Mail: Mail queued, not delivered

Please i need an advise from an Expert, it is big problem for me.