Possible App (for language translation)

it would be nearly impossible because apple wrote both the mail and SMS app. Not to mention translation software is horrid.

 

Of course it's still technically possible...but you'd have to write a whole email program...and even then you wouldn't get received messages without opening up the application (at least until Apple decides to add push).

 

One or both sides could just push their email through google's translator etc. In a way, it almost sounds like you need an Automator/automated take email with specifc email address, copy all, push through babelfish/other, get results, reemail to yourself.

There are presumably alternatives on the market i'd imagine. As for an iPhone app - if you could cut and paste, you could just use Google's translate.

Depends what quality of translation you want!