A few suggestions:

1. Install ssh on your maemo. You may then use scp or WinScp if you're a windows user to copy files from your N900 file system to your desktop.

2. If you have an ssh server you can also use scp from your device.

3. You can also use wget or curl to to http upload of your files if you have an http storage somewhere.

4. Regarding email look for mutt and or elm.

And also, you don't explain why you can't use a the default mail client or the browser in order to send your files.

Regards,
Dov