[cac]

When I send an email from my Outlook or Yahoo account, the sent email does not appear on the Blackberry. Vice versa if I send from the Blackberry. Is this how it's supposed to work?

[Scr_ooge]

Try:
Open messages-> Options-> Email Settings.
Press Options key-> Folder redirection
Mark your email address->Press Wheel->Expand

Now you should see all your mail folders.

Is the "Sent" folder checked?