Whenever I have problems, I ask for the technical experts at Cingular - not customer care, but the "technical experts." (You may have to get a user name and password from customer care.)
Here are settings which work on my phone: start , messaging, mmode, menu, options, account set-up, mmode,
add user name
add your mmode email address
unclick automatic set up
next
user name
add your pass word
leave domain open
click save password, next
server type: pop3
account name: mmode
network: the internet, next
incoming server

op.mymmode.com
unclick require ssl
outgoingserver:smtp.mymmode.com
unclick outgoing servers requires authentication
the other settings are your choice