Re: [courier-users] IDN in domain name

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Hi.

On Tuesday 15 April 2008, Jesper Langkj=E6r wrote:
> Hi..
>
> I've live i Denmark and pretty funny letters like (=E6=F8=E5 =C6=D8=C5)
> And now when you can have this i your domain name we have som problem
> with courier-0.56.0-1.6.
> When we try to send mail to ex. permat=E6t.dk we get an "#5.0.0 smtp; 501=
Bad
> address syntax"
>
> Are ther anything we can do about that ?

As far as I know the IDN specs, all server applications should never been=20
bugged with IDN domain names. Clients should do the punycode conversion=20
offline and then only use the xn--foobar-...-version in SMTP dialog.

Quote from http://tools.ietf.org/html/rfc3490#section-6 about the=20
communication of the client program to the server:
| ACE unless the protocol is updated to handle other encodings

But hey, IMO it's a *really* bad idea to use IDN for e-mail at all.

In practice, nearly noone does only provide his webpage via IDN because peo=
ple=20
with non-native keyboards will not be able to call the address. Concerning=
=20
e-mail, this is even worse, I think. There aren't many client programs out=
=20
there that can handle IDN addresses and it breaks the allowed characters fo=
r=20
header fields as described in RFC 2822.

regards, Bernd

=2D-=20
There are only two things wrong with C++:
The initial concept and the implementation. - Bertrand Meyer

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