Android™

Check if the SMTP Server Supports DSN

Demonstrates the Chilkat MailMan.IsSmtpDsnCapable method, which contacts the SMTP server and determines whether it supports the DSN (Delivery Status Notification) extension defined by RFC 3461. This example configures the SMTP connection and reports whether DSN is available.

Background: DSN lets a sender request a delivery receipt — asking the mail system to report back on success, failure, or delay for each recipient. Not every server offers it, so IsSmtpDsnCapable probes the server's advertised EHLO capabilities first. Checking before relying on DSN-related settings avoids surprises when a server silently ignores a receipt request it does not support.

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Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //  Demonstrates the MailMan.IsSmtpDsnCapable method, which contacts the SMTP server and
    //  determines whether it supports the DSN (Delivery Status Notification) extension defined
    //  by RFC 3461.

    CkMailMan mailman = new CkMailMan();

    //  Configure the SMTP server connection.
    mailman.put_SmtpHost("smtp.example.com");
    mailman.put_SmtpPort(465);
    mailman.put_SmtpSsl(true);
    mailman.put_SmtpUsername("user@example.com");
    mailman.put_SmtpPassword("myPassword");

    //  Check whether the server supports DSN.
    boolean dsnCapable = mailman.IsSmtpDsnCapable();

    if (dsnCapable == true) {
        Log.i(TAG, "The SMTP server supports DSN.");
        }
    else {
        Log.i(TAG, "The SMTP server does not support DSN.");
        }

    //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
    //  connects and authenticates -- using the property settings above -- whenever a server
    //  operation requires it.  Calling the explicit connect/authenticate methods can still be
    //  helpful to determine whether a failure occurs while connecting or while authenticating.

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}