mb_convert_encoding(): Argument #3 contains invalid encoding "WINDOWS-1258"

[gnomii]

Describe the bug
An PHP error when tries to convert the encoding of content:

FastCGI sent in stderr: "PHP message: CantGetMessageList[201]PHP message: mb_convert_encoding(): Argument #3 ($from_encoding) contains invalid encoding "WINDOWS-1258" @ snappymail/v/2.6.2/app/libraries/MailSo/Base/Utils.php#283" while reading response header from upstream

To Reproduce
Receive an email with charset "windows-1258". I think the email client is on windows, but I have not windows system. I can not test on windows

Desktop (please complete the following information):

• SnappyMail Version 2.6.2
• PHP 8.0.8

[the-djmaze]

I've made a change to remove the hardcoded encodings list and use the real list with aliases.
You can try the changed file if it helps.

[gnomii]

It seems ok. I have no error in logs.

Thanks you very much

[the-djmaze]

Great, now you can read Vietnamese.
It's indeed Windows OS (which i don't have either), and IBM names it cp1258 and is 99% cp1252/Windows-1252.

It's really oldschool (yes you Outlook Word processor) and most e-mails should be UTF-7 or UTF-8 to properly write vietnamese (or any other language that does not fit in the ASCII table).

But for now, it just ignores the encoding when it's not in the mb_* list