Untitled

open(XMLFILE, ">:utf8", $xmlfile);
print XMLFILE "<?xml version="1.0" encoding="utf-8"?>n";
print XMLFILE "<data>n";
#print XMLFILE "...n";
print XMLFILE "</data>n";
close (XMLFILE);

open(MUTT, "|/usr/bin/mutt -s "TestSubject" -a $xmlfile "test@example.com"");
binmode MUTT, ":utf8";
print MUTT ("TestBody");
close (MUTT);

$ mutt -e "set content_type=text/html" Email address -s "subject" < test.html

open(MUTT, "|/usr/bin/mutt -e "set content_type=text/xml" -s "TestSubject" -a $xmlfile "test@example.com"");

### method #1
$ mail -a 'MIME-Version: 1.0' -a 'Content-Type: text/xml; charset=iso-8859-1' -a 'X-AUTOR: Some Guy' -s 'MTA STATUS: mail queue' <to user>  -- -f <from user>  < /tmp/eximrep.xml

### method #2
 $ mail -a 'Content-type: text/xml; charset="us-ascii"' <to user> < /tmp/file.xml

(
echo "From: myuser@example.com"
echo "To: user@example.net"
echo "MIME-Version: 1.0"
echo "Content-Type: multipart/mixed;"
echo ' boundary="BOUNDARY"'
echo "Subject: Test Message"
echo ""
echo "This is a MIME-encapsulated message"
echo "--BOUNDARY"
echo "Content-Type: text/plain"
echo ""
echo "This is what someone would see without an HTML capable mail client."
echo ""
echo "--BOUNDARY"
echo "Content-Type: text/html"
echo ""
echo "<html>
<body bgcolor='black'>
<blockquote><font color='green'>GREEN</font> <font color='white'>WHITE</font> <font color='red'>RED</font></blockquote>
</body>
</html>"
echo "--BOUNDARY--"
) | sendmail -t

<?xml ... ?>
<?comment <!-- ł€èÄöÜß --> ?>
<content>
    ...
</content>

-e 'set send_charset="utf-8"'