Jani Ollikainen writes:
I've tried to add IDNA coded domain to courier as hosteddomain and making virtual users to it. But the emails doesn't go to users inbox they are forwarded to relay smtp so courier thinks that it isn't local/hosted. I've added normal domain identically and it works.So maybe something get's broken if domain is for example: xn--jpuikko-5waa.fi (jääpuikko.fi in uncoded form) Is this a known issue or am I missing something?
You're probably missing something. The mail server doesn't care about IDNA coding, it deals with actual mail domains only.
IDNA coding only matters to mail clients, when they display mail addresses. Only sqwebmail would need to care about IDNA, and it's not implemented presently.
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