[Bug 781487] Re: Fails to process Vietnamese Characters in email links

[Mark Sapiro]

Tú@gmail.com is not a valid email address, at least for SMTP. The
various SMTP and message format RFCs (821, 822, 2821, 2822, 5321 and
5322) all require that email addresses contain only us-ascii characters.
There are extensions such as RFC 2047 and RFC 2231 that specify encoding
for non-ascii characters in email message headers, but RFC 2047 at least
is clear that email addresses can't be encoded, and in any case, these
apply only to headers in message text, not to email addresses in SMTP
MAIL FROM and RCPT TO commands.

The fact that the invalid email address is reported as "Error: Illegal
Email Address: Tú@gmail.com" and not "Error: Illegal Email Address:
Tú@gmail.com" is due to overprotecting against XSS attacks resulting of
double-escaping of the & character. This is fixed in 2.1.13.

I am unable to duplicate "If the email address have words such then
mailman spews out 'We've hit a bug' page." even at
<http://ngocentre.org.vn/mailman/listinfo/wildtrade>. Please be more
specific as to exactly what is entered where to produce this, and if
possible provide the traceback from Mailman's error log.

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https://bugs.launchpad.net/bugs/781487

Title:
  Fails to process Vietnamese Characters in email links