TS3899 iPhone 5s Mail app shut down automatically when try to send email

Question

I just set up new iPhone 5s two days ago from iPhone 5.
Everything works fine except Mail app.
Due to Mail app, I had to set up new configuation instead of back up from old iPhone 5.
Mail app works fine 1 day, but after the day after, the mail app shut down automatically when try to send email.
Just one specific email account has problem. It worked fine on iPhone 5. Same setting on Pop and SMTP. Exactly same~~
- I did try to reset iPhone 5s pressing home button and sleep button for 10 second. It did not work
- I did try to reset all information and install iPhone 5s and the problem still exists.
- I did try to delete specific email account and re-make it, but it did not work
Funny thing is that if Lanuague is English, then sending email is working. Absolutely no problem.
However, if Language setting is Korean, then Mail App shut down automatically.
I'm heavy email maker and if it is very annoying.
Does anyone have same issue like this?
I believed it is iOS7 bug?
Can anyone help me on this???

Answer 1

Am having similar problems with a new iPad Air. It will recieve email in Mail as directd from my domain email account. It will not send, advising server does not recognise account. I have checked and re checked settings.
My computer and old iPad work perfectly. Any ideas would be really appreciated.
By the way sending email directly from the domain email account works perfectly but I prefer using Mail.
James