Database Mail

Hola estoy tyrabajando con SQLServer 2005.

He configurado todo lo que pide el Database Mail, y cuando mando un mail
de prueba me da esto:

Date 6/5/2006 11:51:58 AM
Log Database Mail (Database Mail Log)

Log ID 75
Process ID 5936
Mail Item ID 32
Last Modified 6/5/2006 11:51:58 AM
Last Modified By sa

Message
The mail could not be sent to the recipients because of the mail server
failure. (Sending Mail using Account 2 (2006-06-05T11:51:58). Exception
Message: Could not connect to mail server. (An established connection was
aborted by the software in your host machine).
)

Saludos, Diego