Sending mail through application engine

Dear All;
      I am using "sendemail" function to send mail and the code has been
written at fieldchange event and its working fine and we are receiving mail against it, but when I use the
same code in Application Engine then engine run successfully
but no email got generated.
 
      So can any one suggest me that what should I do. Following
is the code which I am using  for my application engine.



&MAIL_FLAGS = 0;
&MAIL_TO = "xxxxxxxxxx@gmail.com";
&MAIL_CC = "";
&MAIL_BCC = "";
&MAIL_SUBJECT = "Testing SendMail - Do you see reply to?";
&MAIL_TEXT = "This is a test for SendMail function. -David";