Please describe the problem:
Evolution does handle IDN Domains badly. Non-ASCII characters are sent to the smtp server. This needs a fix, either by checking for non-ASCII characters or by Implementing IDN support (preferred). Please have a look at RFC 3490 and libidn

My Evo is current Ubuntu Jaunty Version

Steps to reproduce:
1. Try sending mail to trash@şøñđëřżēıċħęŋđőmæîņĭśŧşũþėŗ.de
2. Check what is sent to the smtp server


Actual results:
RCPT TO: Contains non-ASCII characters

Expected results:
Conversion into trash@xn--m-4fanol5b8b4f5bcu8cu9qrdqc8wzcufrf0a1d2dta3r1b87a.de

Does this happen every time?
Of course

Other information:
trash address goes to /dev/null according to blog of domain owner (FH), so I assume it is okay if you use it for testing as well :-)

see also http://fholzhauer.de/archives/2009/02/10/s%C3%B8nderzeichendom%C3%A6inistsu%C3%BEerde/ (in German)