com.sun.mail.smtp.SMTPSendFailedException：541 5.4.1 内容被内部防火墙阻止

Question

I am getting 541 5.4.1 Content blocked by Internal Firewall exception when i am sending a email in java. I have to send a calendar event so i am using String buffer and appending the content, when iam setting the content and sending email, i am getting blocked by internet firewall. Below iam keeping the code.

public void send(Appointment appointment, String host) throws Exception {

        try {

            Properties prop = new Properties();
            prop.put("mail.smtp.host", host);
            prop.put("mail.smtp.port", "25");
            prop.put("mail.smtp.auth", "false");
            prop.put("mail.smtp.starttls.enable", "false");

            Session session = Session.getDefaultInstance(prop, null);
            // Define message
            MimeMessage message = new MimeMessage(session);
            message.addHeaderLine("method=REQUEST");
            message.addHeaderLine("charset=UTF-8");
            message.addHeaderLine("component=VEVENT");

            String toMa = StringUtils.getCommaDelimitedStringfromStringList(appointment.getTo());
            String ccMa = StringUtils.getCommaDelimitedStringfromStringList(appointment.getCc());

            message.setFrom(new InternetAddress(appointment.getFrom()));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toMa));
            message.setRecipients(Message.RecipientType.CC, InternetAddress.parse(ccMa));
            message.setSubject(appointment.getSubject());
            message.setHeader("Content-class", "urn:content-classes:calendarmessage");

            String content = getICSString2(appointment, message);

            // Create the message part
            BodyPart messageBodyPart = new MimeBodyPart();

            // Fill the message
            messageBodyPart.setHeader("Content-Class", "urn:content-  
  classes:calendarmessage");
            messageBodyPart.setHeader("Content-ID", "calendar_message");
            messageBodyPart.setDataHandler(new DataHandler(new ByteArrayDataSource(content, "text/calendar")));// very
                                                                                                                // important

            // Create a Multipart
            Multipart multipart = new MimeMultipart();

            // Add part one
            multipart.addBodyPart(messageBodyPart);

            // Put parts in message
            message.setContent(multipart);

            // send message
            Transport.send(message);
        }
        catch (MessagingException me) {
            me.printStackTrace();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }

private String getICSString2(Appointment appointment, MimeMessage message) {

        StringBuilder str = new StringBuilder();

        str.append("BEGIN:VCALENDAR");
        str.append("PRODID: Asset View 2.0");
        str.append("METHOD:REQUEST");
        str.append("BEGIN:VEVENT");

        str.append("DTSTAMP:" + extracted(FORMATED_DATE_TIME, 0, null));

        if (appointment.isIsAllDayEvent()) {

            str.append("DTSTART;VALUE=DATE:" + extracted(FORMATED_DATE, 0, appointment.getStartDate()));
            str.append("DTEND;VALUE=DATE:" + extracted(FORMATED_DATE, 1, appointment.getStartDate()));

        }
        else {
            str.append("DTSTART;VALUE=DATE:" + extracted(FORMATED_DATE_TIME, 0, appointment.getStartDate()));
            str.append("DTEND;VALUE=DATE:" + extracted(FORMATED_DATE_TIME, 0, appointment.getEndDate()));
        }

        createRecurringEvents(appointment, str);
        str.append("LOCATION: " + appointment.getLocation());
        str.append(String.format("UID:%s", UUID.randomUUID().toString()));
        str.append(String.format("DESCRIPTION:%s", appointment.getContent()));
        str.append(String.format("X-ALT-DESC;FMTTYPE=text/html:%s", appointment.getContent()));
        str.append(String.format("SUMMARY:%s", appointment.getSubject()));
        str.append(String.format("ORGANIZER:MAILTO:%s", appointment.getFrom()));
        str.append(String.format("ATTENDEE;CN=\"%s\";RSVP=TRUE:mailto:%s",
                appointment.getTo().stream().findFirst().orElse(null),
                appointment.getTo().stream().findFirst().orElse(null)));
        str.append("X-MICROSOFT-CDO-BUSYSTATUS:FREE");

        str.append("BEGIN:VALARM");
        str.append("ACTION:DISPLAY");
        str.append("DESCRIPTION:REMINDER");
        str.append("TRIGGER:-P1D");
        str.append("END:VALARM");

        str.append("END:VEVENT");
        str.append("END:VCALENDAR");

        return str.toString();
    }
    

Answer 1

I solved the issue by properly setting the content string.

StringBuffer sb = new StringBuffer();

        StringBuffer buffer = sb.append("BEGIN:VCALENDAR\n"+
        "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n"+
        "VERSION:2.0\n" +
        "METHOD:REQUEST\n" +
        "BEGIN:VEVENT\n" +
"ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:"+appointment.getTo().stream().findFirst().orElse(null)+"\n" +
        "ORGANIZER:MAILTO:"+appointment.getFrom()+"\n" +
        "DTSTART:"+extracted(FORMATED_DATE_TIME, 0, appointment.getStartDate())+"\n" +
        "DTEND:"+extracted(FORMATED_DATE, 1, appointment.getEndDate())+"\n" +
        "LOCATION:"+appointment.getLocation()+"\n" +
        "TRANSP:OPAQUE\n" +
        "SEQUENCE:0\n" +
"UID:040000008200E00074C5B7101A82E00800000000002FF466CE3AC5010000000000000000100\n" +
        " 000004377FE5C37984842BF9440448399EB02\n" +
        "DTSTAMP:"+extracted(FORMATED_DATE_TIME, 0, null)+"\n" +
        "CATEGORIES:Meeting\n" +
        "DESCRIPTION:"+appointment.getContent()+"\n" +
        "SUMMARY:"+appointment.getSubject()+"\n" +
        "PRIORITY:5\n" +
        "CLASS:PUBLIC\n" +
        "BEGIN:VALARM\n" +
        "TRIGGER:PT1440M\n" +
        "ACTION:DISPLAY\n" +
        "DESCRIPTION:Reminder\n" +
        "END:VALARM\n" +
        "END:VEVENT\n" +
        "END:VCALENDAR");
        
        return buffer.toString();
    }