Basic regression of IDN domains in Mail, each on MacOS and iOS

For a few years IDN have been appropriately dealt with each on MacOS and iOS. That is not the case.


One other poster already reported on Apple dialogue discussion board that IOS mail is not in a position to ship mail from an IDN e mail deal with, all the time displaying an incorrect message about an “invalid deal with”. This poster solely had common incompetent recommendation from an Apple poster about checking his e mail account configuration. As this poster already reported an IDN account with labored beforehand not does. I can not date exactly which launch of iOS regressed. iOS 15 for certain, 14 probably.


Since yesterday, I spend time attempting to determine why my S/MIME certificates not labored on my Mac, for a similar IDN e mail account. After many check I found out a partial workaround :

  • the S/MIME certificates is setup with the punnycode type of the IDN area
  • including an identification desire for the certificates did no assist
  • however modifying this identification desire by altering the punnycode kind to the utf (accented, NFC kind) kind did assist : the Mail app is now in a position to signal outgoing e mail.
  • I discover no option to restore the power to encrypt e mail for this account neither replying to a different account for which I’ve one other certificates, nor sending encrypted mail to the IDN deal with from that different account.

Clearly on each iOS and MacOS there’s a regression within the punnycode/utf translation/comparability. Which may be as a result of utf8/utf16 conundrum or normalization varieties NFC/NFD.

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