mail.log output:

Send e-mail without any special chars in Sender name:
May 16 02:04:48 ubuntu606m postfix/pickup[15330]: 18896BD0001: uid=33 from=<www-data>
May 16 02:04:48 ubuntu606m postfix/cleanup[15813]: 18896BD0001: message-id=<c84d84bb81747cb4a865b12793c84b74@staging.videoboom.se>
May 16 02:04:48 ubuntu606m postfix/smtp[15815]: 18896BD0001: to=<fredrik@demomusic.nu>, relay=mail2.surftown.se[212.97.132.42], delay=0, status=sent (250 ok 1179273866 qp 22524)

Sending with special chars (åäöé):
No output at all!