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I noticed recently that certain German characters (ß, Ü, Ä/ä, Ö/ö) are displayed incorrectly in the subject header of messages if (and only if) they are followed either by a space or no character (within the subject header). This only affects Mobile Mail on iOS, but not Mail on macOS. Even more mysteriously, the lowercase Umlaut ü is not affected.

The example subject lines L(ü|ä|ö) are displayed correctly in macOS Mail, a webmail interface and other clients (like mutt). The message source looks as expected:

Subject: =?iso-8859-1?Q?L=FC?=
Subject: =?iso-8859-1?Q?L=E4?=
Subject: =?iso-8859-1?Q?L=F6?=

In Mobile Mail, the subject looks like this (as I said, lowercase ü is the only umlaut not affected):

L�

L�

Does anyone know about this bug in iOS Mail?

Thanks, Jan

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  • Which mail application is used to send one of these mails?
    – nohillside
    Commented Feb 20, 2022 at 20:33
  • Do you see this when you send a message to yourself from iOS Mail? Commented Feb 20, 2022 at 21:58
  • No, this only happens when using mutt (my primary MUA).
    – janeden
    Commented Feb 21, 2022 at 13:47
  • That also happens with É for me. But it produces: ÔøΩ
    – Thinkr
    Commented Jun 11, 2023 at 12:02

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