Small formatting fixes for the message example.

Author: karastojko

examples/message.cpp

@@ -43,6 +43,7 @@ int main()
         string msg_str;
         msg.format(msg_str);
         cout << msg_str << endl;
+        // The subject is printed as `=?UTF-8?Q?=D0=97=D0=B4=D1=80=D0=B0=D0=B2=D0=BE,_=D0=A1=D0=B2=D0=B5=D1=82=D0?=\r\n =?UTF-8?Q?=B5!?=`
     }
 
     // Set the file encoding to UTF-8 to properly see the letters in this snippet.
@@ -84,12 +85,12 @@ int main()
         string msg_str;
         msg.format(msg_str);
         cout << msg_str << endl;
-        // The subject is printed as `=?ISO-8859-5?Q?=B7=D4=E0=D0=D2=DE,_=C1=D2=D5=E2=D5?=`.
     }
 
     // Set the file encoding to UTF-8 to properly see the letters in this snippet.
     {
         message msg;
+        msg.header_codec(message::header_codec_t::QUOTED_PRINTABLE);
         msg.from(mail_address("mail io", "contact@mailio.dev"));
         msg.add_recipient(mail_address("mail io", "contact@mailio.dev"));
         msg.content_transfer_encoding(mime::content_transfer_encoding_t::BASE_64);

test/test_message.cpp

@@ -4503,7 +4503,7 @@ BOOST_AUTO_TEST_CASE(parse_attachment_utf8)
         "Date: Thu, 11 Feb 2016 22:56:22 +0000\r\n"
         "MIME-Version: 1.0\r\n"
         "Content-Type: multipart/mixed; boundary=\"mybnd\"\r\n"
-        "Subject: format attachment utf8\r\n"
+        "Subject: parse attachment utf8\r\n"
         "\r\n"
         "--mybnd\r\n"
         "Content-Type: text/plain; \r\n"