增加了检测发送邮件到小号的功能，还在建设中。
增加了收取金币的功能，研究是否需要。

--@@ TODO: solve COD item, maybe displaying COD amount above the slot icon or using tool-tip

--@@ TODO: function SortDB must clear up! collect garbage !!!
	--UC..

--@@ TODO: add searching bar!

--@@ TODO: add AH ordering
	--UC..bad to do

--@@ TODO: should stacked attachments can be collect??

--@@ TODO: collect mailbox gold??
	--DONE!

--@@ TODO: should attachments info be save to database when sending to known player's other characters?
	--UC..

--@@ TODO: should attachments be alert to player to collect when almost in deadline?