React Native Requires Chilkat v11.0.0+

Fetch Oldest/Newest IMAP Email

Emails may be downloaded by sequence number. Assuming the selected mailbox is not empty, the oldest email is at sequence number 1, and the newest email is at sequence number N. The FetchSingle method may be used to download by sequence number. React Native

import { Email, Imap } from '@chilkat/react-native'

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

  const imap = new Imap();

  // Connect to an IMAP server.
  // Use TLS
  imap.ssl = true;
  imap.port = 993;
  try {
    await imap.connectAsync('mail.testemail.net');
  } catch {
    console.log(imap.lastErrorText);
    return;
  }

  // Login
  try {
    await imap.loginAsync('***', '***');
  } catch {
    console.log(imap.lastErrorText);
    return;
  }

  // Select an IMAP mailbox
  try {
    await imap.selectMailboxAsync('Inbox');
  } catch {
    console.log(imap.lastErrorText);
    return;
  }

  // After selecting a mailbox, the NumMessages property
  // contains the number of emails in the selected mailbox.
  const n = imap.numMessages;

  if (n > 0) {

    // The oldest email is always at sequence number 1.
    const isUid = false;

    const oldestEmail = new Email();
    try {
      await imap.fetchEmailAsync(false, 1, isUid, oldestEmail);
    } catch {
      console.log(imap.lastErrorText);
      return;
    }

    // Display the From and Subject
    console.log(oldestEmail.fromAddress);
    console.log(oldestEmail.subject);

    console.log('--');

    // The newest email is at sequence number N:
    const newestEmail = new Email();
    try {
      await imap.fetchEmailAsync(false, n, isUid, newestEmail);
    } catch {
      console.log(imap.lastErrorText);
      return;
    }

    // Display the From and Subject
    console.log(newestEmail.fromAddress);
    console.log(newestEmail.subject);
  }

  // Disconnect from the IMAP server.
  await imap.disconnectAsync();
}