In addition to copying the address, you can also use a virtual keyboard to map your existing keyboard to the keyboard of another language. I know that OS X has this built in, and I am assuming Windows does too.
I have a business card and the email address is in a language I don't know how to type (having a virtual keyboard doesn't mean I know how to reproduce the actual characters, which is true for many languages).
Or worse, somebody is trying to give me their address over the phone.
Here's an example: Try to figure out how to type:
宮本茂@任天堂株式会社.com
Here's another I'm pretty certain I can't figure out with a virtual keyboard.
প্রিয়াংশু.চ্যাটার্জী@बॉलीवुड.com
How about mixed languages? Like the case of a foreign worker assigned to another foreign department in yet a third country.
김기덕@बॉलीवुड.ประเทศไทย.com
I'm not going to tell you what languages these are in. Just pretend you were handed these on business cards or saw them on a slide deck at a conference and can't get a digital copy. Let me know how it goes.