React Native

Send Email to Distribution List

See more SMTP Examples

Sends the same email to a list of 1000 email addresses in 50 sends where each email has 20 recipients.

Note: Chilkat is not intended nor designed for mass emailing. A solution such as this might be used for a corporate emailing to employees, or an emailing to newsletter subscribers.

React Native

import { BinData, Email, MailMan, StringBuilder, StringTable } from '@chilkat/react-native'

async function chilkatExample() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const mailman = new MailMan();

  mailman.smtpHost = 'smtp.mymailserver.com';
  mailman.smtpPort = 465;
  mailman.smtpSsl = true;
  mailman.smtpUsername = 'myUsername';
  mailman.smtpPassword = 'myPassword';

  // Create a new email object
  const email = new Email();
  email.subject = 'This is a test';
  email.body = 'This is a test';
  email.from = 'Senders Name <sender@example.com>';
  email.addTo('Subscribers', 'subscribers@example.com');

  const bdMime = new BinData();
  mailman.renderToMimeBd(email, bdMime);

  // Load a file containing one email address per line.
  const distList = new StringTable();
  try {
    distList.appendFromFile(1000, 'utf-8', 'qa_data/distList.txt');
  } catch {
    console.log(distList.lastErrorText);
    return;
  }

  const sbRecipients = new StringBuilder();

  let i = 0;
  const szDistList = distList.count;
  let j = 0;
  while (i < szDistList) {

    // Build a list of comma-separated recipients.
    if (j > 0) {
      sbRecipients.append(',');
    }

    sbRecipients.append(distList.stringAt(i));

    i++;
    j++;

    // If we have 20 recipients, or we have the final recipient in the final chunk, then send.
    if ((j === 20) || (i === szDistList)) {
      try {
        await mailman.sendMimeBdAsync('sender@example.com', sbRecipients.getAsString(), bdMime);
      } catch {
        console.log(mailman.lastErrorText);
        return;
      }

      j = 0;
      sbRecipients.clear();
    }
  }

  try {
    await mailman.closeSmtpConnectionAsync();
  } catch {
    console.log('Connection to SMTP server not closed cleanly.');
  }

  console.log('Email sent to distirbution list.');
}