Issue with date format while sending email via SMTP

I have issue to format date using Oracle SMTP package. I tried several date formats, but none is working.
When MS email is opened the date format in "Sent:" always shows the incorrect date/time:

Following is the example:

CREATE OR REPLACE PROCEDURE send_email (
   subjecttext     IN       VARCHAR2,
   email_address   IN       VARCHAR2,
   message_body    IN       LONG
)
IS
   sendoraddress   VARCHAR2 (30)       := ' sender@email.com';
   emailserver     VARCHAR2 (30)       := 'smtp.address.com';
   port            NUMBER              := 25;
   conn            UTL_SMTP.connection;
   mesg_header     VARCHAR2 (4000);
   subject         VARCHAR2 (200);
   crlf            VARCHAR2 (2)        := CHR (13) || CHR (10);
BEGIN
   subject := subjecttext;
   conn := UTL_SMTP.open_connection (emailserver, port);
   UTL_SMTP.helo (conn, emailserver);
   UTL_SMTP.mail (conn, sendoraddress);
   UTL_SMTP.rcpt (conn, email_address);

   mesg_header :=
            'Date: '
         || TO_CHAR (SYSDATE, 'MM DD YYYY HH:MI:SS')
         || crlf
         || 'From:'
         || sendoraddress
         || crlf
         || 'Subject:'
         || subject
         || crlf
         || 'To: '
         || email_address
         || crlf
         || ''
         || crlf;
   END IF;

   UTL_SMTP.DATA (conn, mesg_header || crlf || crlf || message_body);
   UTL_SMTP.quit (conn);
EXCEPTION
   WHEN OTHERS
   THEN
      DBMS_OUTPUT.put_line (   'ERROR SQLCODE '
                            || SQLCODE
                            || ' '
                            || SUBSTR (SQLERRM, 1, 200)
                           );
END;
/