Implementation requires support of encoding/decoding of
* login (username with IDN domain part) - can be
implemented in plugin.
* message send (recipient with IDN address). There is
possible header formating violation, because
SquirrelMail sends header in 8bit. Not sure if plugin
can do that without new hooks.
* message display (links to IDN sites). Not sure if
plugin can do that without new hooks.
We should check when we can use IDN and when use of
punycode is required. We might open bunch of security
related bugs, if IDN is implemented incorrectly.
RFC 3490 - Internationalizing Domain Names in
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