if you open up the mail.app on the iphone and get a blank screen which reverts to the desktop about 20 seconds later
assuming you have installer.app - update it
install:
openbsd
community sources (if not already)
openssh
power down the iphone completely
download putty (windows) and start the iphone
connect the usb lead to your pc & iphone
connect to your wifi and note your ip address
open up putty and put the ip address in, click on open
you’ll have to wait around 30 seconds for the key to be generated, when it is and the certifcate prompt comes up say yes
login as: root
type in the password: its either dottie or alpine depending on which version of iphone you have
once you’re logged in (you’ll see the # prompt) type passwd and change it to “whatever you want your new
password to be”
retype your new password
type:
chown -R mobile:mobile /private/var/mobile
press return
turn off & power down and back up and you should be sorted
if u guys still having problem plz follow the links as belows
how to recover & repair from mail.app crash on an iphone « Mr L K’s Ibiza Blog
guys it woks for me,,,,,,,,