You need to check the following in your mail setting

When sending messages

Save a copy of the message in the Sent folder

所有跟帖： 

• 谢谢， 我是一下 -liveinca- ♀ (0 bytes) () 12/06/2013 postreply 13:19:53

• I don't see this option was provided.... -liveinca- ♀ (0 bytes) () 12/06/2013 postreply 13:22:13

• 点一下小齿轮（top right)->settings->writing email->When sending message -Lily3- ♀ (457 bytes) () 12/06/2013 postreply 13:26:53

• Thank you very much. :) I changed the setting and it works now.. -liveinca- ♀ (0 bytes) () 12/06/2013 postreply 13:34:16