Sending Mails Through SQL Server 2005

Hi,
I have a need to shoot and automated mail at regular intervals to clients. I got the following code for sending email from SQL Server but get an error.

ALTER PROCEDURE [dbo].[sp_SMTPMail]

@SenderName varchar(100),

@SenderAddress varchar(100),

@RecipientName varchar(100),

@RecipientAddress varchar(100),

@Subject varchar(200),

@Body varchar(8000),

@MailServer varchar(100) = 'localhost'

AS



SET nocount on



declare @oMail int --Object reference

declare @resultcode int



EXEC @resultcode = sp_OACreate 'SMTPsvg.Mailer', @oMail OUT



if @resultcode = 0

BEGIN

EXEC @resultcode = sp_OASetProperty @oMail, 'RemoteHost', @mailserver

EXEC @resultcode = sp_OASetProperty @oMail, 'FromName', @SenderName

EXEC @resultcode = sp_OASetProperty @oMail, 'FromAddress', @SenderAddress



EXEC @resultcode = sp_OAMethod @oMail, 'AddRecipient', NULL, @RecipientName, @RecipientAddress



EXEC @resultcode = sp_OASetProperty @oMail, 'Subject', @Subject

EXEC @resultcode = sp_OASetProperty @oMail, 'BodyText', @Body





EXEC @resultcode = sp_OAMethod @oMail, 'SendMail', NULL



EXEC sp_OADestroy @oMail

END



SET nocount off


The error is

SQL Server blocked access to procedure 'sys.sp_OACreate' of component 'Ole Automation Procedures' because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of 'Ole Automation Procedures' by using sp_configure. For more information about enabling 'Ole Automation Procedures', see "Surface Area Configuration" in SQL Server Books Online.


Can any one help me please