Mobile Email with UUCP
Subject:   UUCP in 2003... err... 2004
Date:   2004-01-12 15:03:07
From:   anonymous2
Response to: UUCP in 2003... err... 2004

What's wrong with old protocols ?
They have been tested for many years :)
IMHO most users/admins decided that they must use SMTP/POP anyway so one protocol more is a needles complication for them.
BTW Gopher seems to be a good protocol for mobile phone display and "keyboards".