Dear monks, I thought I got a grip on UTF8, reading files and sending emails and merrily started to work on Polish translations only to be greeted with strange characters in Outlook mail client. I come back here humbled.
So to state the problem:

1. To enable several people from several countries to type in several languages, it was decided to store the data like so in a separate text file.
German:

$subjectLine= Ihre Rechnung f0XC30XBCr transaktion ###transactionID###
$line= Mit freundlichen Gr0XC30XBCssen
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( The u with umlaut is stored as corresponding UTF8 codepoint.)

2. I then read the line like so:

$encValue=decode('UTF-8', $line);
$encValueSubject=decode('UTF-8', $subjectLine);
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3. I create a PDF using PDF:API2 with UTF-8 encoding and the file is stored in $pdfout.

4. I then used the following code to send email:

    use Mail::Sender;
        my $mfrom    = $mailFrom ;
        my $pdfmail = new Mail::Sender {from => $mfrom,smtp => 'localh
+ost'};

    $pdfmail->MailFile({to         => $cemail,
                        subject    => $subjectLine,
                        msg        => $line."\n",
                        file       => $pdfout});
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All this works fine for German, Swedish, Norwegian and Danish. Outlook displays everything in the mail correctly.

However, for Polish and Czech , the characters are garbled in the subject line and in the body of the mail. The newlines are also missing in some mails.

Sample text for Czech:

$subjectLine=P0XC50X990XC30XADstup k internetu Wi-Fi
$line = S p0XC50X990XC30XA1telskymi pozdravy,
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I am using Mail::Sender , gone through every type of setting ( like b_charset, b_encoding etc and nothing seems to work)
Am I missing something fundamental here?