If you just subsitute 'UTF-16' with 'UTF-8', then the entire line is correctly decoded with decode('MIME-Header', $str). The encoded part appears to be incorrectly encoded. Probably typical of spammers...

In reply to Re^3: decoding a UTF-16B string found in an email subject by runrig
in thread decoding a UTF-16B string found in an email subject by neaj

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