I don't use sendmail directly like this but I'm pretty sure it will fail on the Header fields (To, Cc, Subject, etc) when they contain extra-ASCII. For that you can use Encode/Encode::MIME::Header.

use Encode;
my $subject = encode("MIME-Header", $some_utf8_string);

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In reply to Re^2: UTF-8 Email Form by Your Mother
in thread UTF-8 Email Form by oswulf

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