How To Send Mail Throuth Trigger ?...

Hi,

I am using Trigger to send me a mail, when ever any DML operation occur on my DepartmentMaster table. my trigger is as follow. CREATE TRIGGER reminder
ON DepartmentMaster
FOR INSERT, UPDATE, DELETE
AS
EXEC master..xp_sendmail 'MaryM',
'Don''t forget to print a report for the distributors.'delete from DepartmentMaster where deptcode = '02'

 my out express is configured with default account. but when ever i delete any row from DepartmentMaster table mail is not sent and i get following error..

Server: Msg 18030, Level 16, State 1, Line 0
xp_sendmail: Either there is no default mail client or the current mail client cannot fulfill the messaging request. Please run Microsoft Outlook and set it as the default mail client.