Using IDNs in email addresses
When you create email aliases, mailing lists, or forward email messages to an account hosted on an IDN domain, you can qualify the email address with the IDN representation of the domain on which the account is hosted.
Important: If your application is not IDN-compliant, you must use the ASCII-encoded representation of the domain name. To view the ASCII-encoded representation, refer to your account details provided in the email sent by your service provider.
If you are creating an email alias for an account on the domain <idn_domain>.com, you may enter the email address user@<idn_domain>.com in the Alias field.
To create an email alias for an account user1 on the domain färgbolaget.nu, type the email address as follows:
user1@färgbolaget.nu
However, if your browser is not IDN-compatible, you must use the ASCII-encoded representation of the domain in the email address as follows: user@<ascii_encoded_domain>.com.
To create an email alias for an account user1 on the domain färgbolaget.nu using its ASCII-encoded representation xn--frgbolaget-q5a.nu, type the email address as follows:
user1@xn--frgbolaget-q5a.nu
If your email client is IDN-compatible, you can use the IDN representation of domain names when you configure an email account or send messages using an email client. If the email client does not provide IDN support, you must use the ASCII-encoded representation of the domain name in the email address.
Note: Email clients running on the Linux operating system do not support IDN. You must qualify the email address with the ASCII-encoded representation of the domain on which the account is hosted.