Xperia X10 :: Email-accessing Mp3. Attachments?

But for now,I have a basic inquiry.i use aol email(accessed using tmobile web n walk) and need to access music i receive to work on .when i receive a mail over 5mb,i do not have the option to open or save it?why is this(even my old c902 had no limit as such)?also an attachment accessed via my laptop measured at say for instance,4.5mb(a fairly normal music file size) will be increased by 20% or so in size when accessing it via the X10?why?this is pushing most of the files over this 5mb limit(if there is indeed a limit)Would setting up a different email account make any difference or how i view/access my mail?are there any other settings i could change?ive contacted SE and they see no reason for it not to work 'in theory' but havnt actually guided me to any solution.