here my query is

CREATE TRIGGER NewCustomer1 ON CustomerInfo2
DECLARE @custid varchar(5)

SELECT @custID = Customer_id FROM inserted

EXEC master..xp_startmail
EXEC master..xp_sendmail
@recipients =
'', @subject = @custid,
@message = 'A new customer has been added.'
EXEC master..xp_stopmail

what i want is i want send any message to the mailid
for that i wrote the trigger like that
but waht is my problem is the message is not going to concerned mailid
after excuting the trigger i checked that mail
but no message i received
where did i mistake
plz help me in query