Domains iin Unicode usernames are turned into A-labels

[jrlevine]

If I log into roundcube with a name like <unicode>@<unicode>, it turns that into <unicode>@ASCII, changing the U-labels in the domain into A-labels. This affects both what goes on the From: line in outgoing mail, and what is sent to the IMAP and submission servers to log in. While I can understand why you might want to turn ASCII@<unicode> into ASCII@A-labels for the benefit of non-EAI systems, <unicode>@ASCII is still an EAI address so it wouldn't help. My mail server runs Courier which expects <unicode>@<unicode> to be sent as-is, so it's caused interop problems for me.

This also affects the Reply-To address in the identities setting, but To: addresses entered into mail messages are OK. Haven't checked what address book entries do yet.

I asked the people who wrote the EAI specs who agree that Unicode addresses should stay as-is whenever possible.