How to email to germany?

ok I have a friend in germnay and I live in america. Well she gave me her email and I gave her mine but when I send her and email it does not work and I know I got the right email. A email comes back and says it failed to deliver. Well in germnay it ends instead of .com it's .de I don't know if thta has anything to with it. And it ???somwhitng goes(I won't pu it here) @veb.de. What should I do and what could it be?

ok I have a friend in germnay and I live in america. Well she gave me her email and I gave her mine but when I send her and email it does not work and I know I got the right email. A email comes back and says it failed to deliver. Well in germnay it ends instead of .com it's .de I don't know if thta has anything to with it. It's something (I won't put it here) @veb.de. What should I do and what could it be?

It should still work if it's .de, I send lots of emails to people in germany. Can you look at the email again, the complete version where it gives you the entire error message? post it here - there should be another reason other than 'failure to deliver'