A friend of mine recently replaced his broken iPhone4S with an iPhone5 through Telecom. Walked in, said it was for a Skinny SIM, paid for it and walked out. It was all set up for calls, data and email etc and everything has been fine until this week.

Calls are fine and he can receive email ok, but he cant send email. It keeps giving an error about not being able to connect to the SMTP server. No settings have changed, the username and passwords are correct and I've looked at it for an hour (I know most things but don't have a lot of experience with iPhones) and I cannot for the life of me get it to work. It's a regular POP account he has used on various iPhones for years.

Ive tried:
on wifi,
on 3G
deleting the account and recreating it
and have double checked the details against his desktop (which works perfectly), what his provider says and even his old phone.

Everything is correct, setting up POP is not rocket science after all, but is there anything I might have over looked with it being an iPhone ? I saw somewhere it may have to set up through itunes, but he's had no problems for the six weeks he's owned it until now.

I know it's a shot in the dark but does anyone have any ideas ?

Cheers