i've been using mail for quite some time and finally received an error message while trying to forward something from my work address. my mail box is full! so today i went in and cleaned out all the spam, sent messages, and deleted message. also readjusted my settings so these would clean out automatically after X amount of time. typically when i have mail open I use the top inbox, sent, junk under 'mailboxes'. i store all my personal items under the 'on my mac' folders. then there's the 'matt home' which i really don't know what that is. when i open up the 'all mail' folder there are over 5000 messages in there. some are messages that i want to keep, but the majority (all but maybe 200) are junk/spam. is the 'matt home' where my mailbox pulls information from? or can i delete it without affecting the top folders? or else how do i get rid of all this junk? the spam/sent/trash folders under the 'matt home' are all empty. image which hope describes what i'm talking about. thanks!!