^ Interesting.
I just tested it with wi-fi. CF loaded up, I clicked on the E-Mail button, and it went into "Receiving" almost immediately, like it normally does... then took ~45 seconds to start to download the 10 or so messages from my e-mail account. Once the actual download started, it went relatively fast.
So the results are the same as
above, just instead of taking 60 seconds to start receiving the mail, it took 45.