Java

Count the Report Parts in a multipart/report Email

Demonstrates the read-only Chilkat Email.NumReports property, which is the number of report parts in a multipart/report email. A part is counted as a report when its Content-Type is message/* (except message/rfc822) or text/rfc822-headers. Use GetReport to retrieve the body of each report part; indexes are zero-based. This example loads a report email and prints each report part.

Background: When a message can't be delivered, the mail system usually sends back a bounce known as a Delivery Status Notification (DSN). DSNs use the multipart/report structure, which bundles several parts: a human-readable explanation, a machine-readable message/delivery-status part describing exactly what happened (recipient, status code, failing server), and often the original message's headers. Reading these report parts lets a program automatically detect and process bounces.

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Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  Demonstrates the read-only Email.NumReports property, which is the number of report
    //  parts in a multipart/report email (for example, a Delivery Status Notification).
    //  Use GetReport to retrieve the body of each report part.  Indexes are zero-based.

    CkEmail email = new CkEmail();

    //  Load a multipart/report email (such as a bounce / DSN message).
    success = email.LoadEml("qa_data/eml/dsn_bounce.eml");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    int n = email.get_NumReports();
    System.out.println("NumReports = " + n);

    int i;
    for (i = 0; i <= n - 1; i++) {
        System.out.println("---- Report " + i + " ----");
        System.out.println(email.getReport(i));
        }
  }
}