Send MIME Bytes from a BinData via SMTP

See more SMTP Examples

Demonstrates the Chilkat MailMan.SendMimeBd method, which sends an email from caller-supplied MIME bytes held in a BinData. The arguments are the from address, the recipient list (the SMTP envelope recipients), and the BinData containing the MIME. This example loads a .eml file into a BinData and sends it.

Important: When sending caller-supplied MIME, ensure the Message-ID header is unique for each message. Sending MIME whose Message-ID was previously used can cause the message to be silently discarded as a duplicate by mail servers — see chilkatsoft.com/email_duplicate_message_id.asp.

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the MailMan.SendMimeBd method, which sends an email from caller-supplied MIME
  // bytes held in a BinData.  The arguments are the from address, the recipient list (the SMTP
  // envelope recipients), and the BinData containing the MIME.

  final mailman = CkMailMan();

  // Configure the SMTP server connection.
  mailman.smtpHost = 'smtp.example.com';
  mailman.smtpPort = 465;
  mailman.smtpSsl = true;
  mailman.smtpUsername = 'user@example.com';
  mailman.smtpPassword = 'myPassword';

  // Load the MIME bytes to send.  Here we read a .eml file, but the bytes could come from
  // any source.
  final bdMime = CkBinData();
  try {
    bdMime.loadFile('qa_data/eml/message.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // IMPORTANT: When sending caller-supplied MIME, make sure the Message-ID header is unique
  // for each message.  Sending MIME that contains a Message-ID that was previously sent can
  // cause the message to be silently discarded as a duplicate by mail servers.  For details,
  // see: https://www.chilkatsoft.com/email_duplicate_message_id.asp

  // Send the MIME bytes to the envelope recipient(s).
  try {
    mailman.sendMimeBd('alice@example.com', 'bob@example.com', bdMime);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('MIME email sent.');

  // Note: The path "qa_data/eml/message.eml" is a relative local filesystem path,
  // relative to the current working directory of the running application.

  // 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.
}