Using IDNs in email addresses
When you forward email messages to an email account hosted on an IDN, 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 the Site Administrator.
If you are forwarding an email message to an account on the domain <idn_domain>.com, you may enter the email address user@<idn_domain>.com in the Forward to field.
To forward an email message to 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 forward an email message to 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 send email messages. 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: If you are using SquirrelMail or an email client running on the Linux operating system, you must use the ASCII-encoded representation of the domain in the email address.