545578 - Internationalized domain name isn't supported

Status: RESOLVED DUPLICATE of bug 127399

(Thunderbird :: General, defect)

Description

[谢继雷]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.78 Safari/532.5
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b3pre) Gecko/20090223 Thunderbird/3.0b2

Can't send mails with address in IDN representation.

Reproducible: Always

Steps to Reproduce:
1. Compose a mail to example@域名.com
2. Send mail
3. An error shows that the characters "域名.com" wasn't encoded to IDN string "xn--eqrt2g.com“



Expected Results:  
The IDN domain should be encoded correctly.

See RFC 3490, 3454, 3491

Comment 1

[Jo Hermans]

See <http://www.mozilla.org/projects/security/tld-idn-policy-list.html> for an
explanation, and a workaround. See bug 279099 for an example what can go wrong
with a simple URL like www.paypal.com (example for firefox).

.com isn't in in the list of TLD's that can use IDN characters. You risk to become a victim of what is called a "IDN homograph attack" (see
<http://en.wikipedia.org/wiki/IDN_homograph_attack>) if you use such URL's,
that's why you see it displayed as xn--eqrt2g.com.

Mozilla uses a more restricted policy than other browsers, but work is been
done in several bugs, like bug 316727 and bug 479520. Registrars might also
help, by disallowing certain character combinations.

Comment 2

[Jo Hermans]

Sorry, the remark was about the IDN characters themselves. But in the case of .com, it should have been translated to [e-mail] , which isn't supported at all (yet).