Diacritics stripped in emails labelled as [Possible phishing attempt]

[Fabien-Maury]

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Prerequisites

• I have searched open and closed issues to make sure that the bug has not yet been reported.

Bug report

Describe the bug
A clear and concise description of what the bug is.

When an email is forwarded to my inbox from a SimpleLogin alias, it seems characters with diacritics are removed from the text if the email is auto-labelled as a possible phishing attempt. This can make the text hard to understand.

Expected behavior
A clear and concise description of what you expected to happen.

If an email sent to a SimpleLogin alias address, is automatically flagged as possible phishing attempt by SimpleLogin, the characters with diacritics will be removed from the text forwarded to the receiver email address.

Screenshots
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The language in this example is French, which uses diacritics. In this case the text is harder to understand but still readable. In other cases it may cause misunderstandings because a missing diacritic can change the meaning of the word.

Environment (If applicable):

• So far observed in Windows 10 web client (Chromium-based browser), and Android 14 app, but I believe this does not depend on the environment.

Additional context
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[nguyenkims]

I think the initial email has the wrong encoding so it's messed up when SL tries to add the warning message to email body. Do you know if the email is correctly displayed if SL isn't involved?

[Fabien-Maury]

Hello, thanks for looking at the issue.

Yes, this email has also been received by another of my email addresses and it is displayed correctly. This issue happened several times with different emails from various senders, receivers, and aliases. And the problem seems to happen not only with diacritics, but also other special characters like apostrophes.

[nguyenkims]

Thanks, can you send me the website where the error can be reproduced please so we can investigate?