Why does this work? I'll tell you. When you send this e-mail, you are sending it through the AOL MAIL SERVER. It will not accept file attachments without a valid password. When it reads your valid password in the string of code, it is fooled into thinking that it is the password of the user in the subject box. But since AOL cannot discard file attachments under a certain size, It returns the e-mail to you, accidently correcting the password. HAVE FUN!!!
*DISCLAIMER* I am not responsible if someone decides to exploit this error in AOL Mail Server, or for AOL being stupid. Only for people who have AOL SN!!