Hello, we've some clients sending messages to umlaut (UTF8) domains. As far as I know, the client is responsible for converting any UTF8 domain into the punycode form.
It seems, that there are clients (squirrel mail, thunderbird, …?) not beeing aware of the problem. As far as I see, there are "allow_utf8_domains", and "dns_check_names_pattern" which can influence Exims handling of UTF8 domains, but finally Exim uses the local resolver for resolving the domains. I'm thinking about using a rewrite rule to transfrom the UTF8 domain names into punycode ones. Without rewriting the domains Exim would ask the resolver about the UTF8 names. Even if the resolver would resolve such names, I think, there is no guarantee about how other MTAs will handle such message. My questions: Are there other or cleaner solutions out there? Does somebody already do it? Does there an UTF8 capable DNS resolver exist? Thank you and Greetings from Dresden/Germany, -- Heiko Schlittermann
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