I use Yahoo! Mail Plus.
The regular Yahoo! Mail has 250 MBs of storage space, and a maximum of 10 MBs of encoded message size (which means you can send about 7-7,5 MBs of data in one message).
Yahoo! Mail Plus costs 20 dollars a year. In that case, storage size is 2 GBs (yes, 2 gigabytes), max. message size is 20 MBs (14-15 MBs of data in one message), and you can use your own e-mail software, you don't have to use if through the web browser window.
I am very satisfied with it.
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