Wirelessly posted (Verizon 8830: BlackBerry8830/4.2.2 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/105)
I have not experienced any limit.
I think your answer is dictated more by the size limit of your the provider of your e-mail account. For example, if your hotmail acct only takes 10 mb then your e-mails will be no larger than 10 mb
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