php - problems showing the right special characters in email -

i have php file generates automatic email. inside email, there special characters (ä,ö,ü) don't show correctly. replace question mark.

can me in this? can change inside php code?

this php file: click here

set email header utf8 charset

mail($to,$subject,utf8_decode($message),$from."\ncontent-type: text/plain; charset=utf-8\ncontent-transfer-encoding: 8bit\n");

this solve problem.

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