I have encountered a bizarre fault with my iPhone. I have been sending and receiving emails perfectly until yesterday. I am using a POP mailbox for my incoming mail and routing my outgoing mail via GMail. Mysteriously after a linked my iPhone to my computer to put some songs on it the sync erased the password details for my outgoing mail server. When I enter the password details it doesn't save them. So I can't send any mail as it doesn't connect to the server. When I go into advanced mail settings the option to ask for authentication is grayed over and isn't selectable. I'm guessing that this is the problem, and I don't now how to change this. I thought that it could be a glitch in the hardware so I did a full restore (twice!) and still the same fault. I have also tried deleting the email account and setting it up again. But each time after saving the outgoing password it erases it and says password is 'optional'. I have also tried resetting the network settings, but this hasn't worked either. For some reason when I re-enter all of the details for the outgoing server and save the information entered, it discards the password even after the save, I just cannot figure out why the password will not stick in the memory even after resetting. It classes the password field as optional but will not allow me to make this a necessary field. Any help would be greatly appreciated.