First issue is that OS X Apple Mail 8.2 thinks Mark's email is junk/spam. So check in your spam folders whilst these tests are being conducted. My experiences are that there is a tendency for spam filtering systems to tend towards intolerant for IDNs André Schappo On 6 Mar 2016, at 15:30, Mark Svancarek <marksv@microsoft.com<mailto:marksv@microsoft.com>> wrote: Here are two addresses for testing. Please send some messages to these addresses, then share back the results. مارك@رسيل.السعودية<mailto:%D9%85%D8%A7%D8%B1%D9%83@xn--wgbe5cxa.xn--mgberp4a5d4ar> 微软测试@互联网.中国<mailto:%E5%BE%AE%E8%BD%AF%E6%B5%8B%E8%AF%95@xn--blq510jgwa.xn--fiqs8s> Please tell us your configuration: · OS · Browser version (if you used a browser mail application) · Email application version(if you didn’t use a browser) Also send us the results. Even if it worked perfectly, we need to know. If it failed or has an error, share the error text. If address was changed to punycode, share that also. Thank you for your help achieving Universal Acceptance in the email ecosystem! -Mark Svancarek 猴猴猴猴猴猴猴猴猴猴猴猴猴猴 http://twitter.com/andreschappo http://schappo.blogspot.co.uk http://weibo.com/andreschappo