Fetch a Range of POP3 Messages

See more POP3 Examples

Demonstrates the Chilkat MailMan.FetchRange method, which retrieves a range of messages from the POP3 mailbox and appends them to an EmailBundle. The arguments are keepOnServer, headersOnly, numBodyLines, a zero-based inclusive startIndex and endIndex, and the EmailBundle. This example fetches the first five messages.

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

async function chilkatExample() {
  // Demonstrates the MailMan.FetchRange method, which retrieves a range of messages from the
  // POP3 mailbox and appends them to an EmailBundle.  The arguments are keepOnServer,
  // headersOnly, numBodyLines, startIndex, endIndex, and the EmailBundle.  The indexes are
  // zero-based and inclusive.

  const mailman = new MailMan();

  // Configure the POP3 server connection.
  mailman.mailHost = 'pop.example.com';
  mailman.mailPort = 995;
  mailman.popSsl = true;
  mailman.popUsername = 'user@example.com';
  mailman.popPassword = 'myPassword';

  // Fetch the first 5 messages (indexes 0 through 4), full bodies, leaving them on the server.
  // keepOnServer=true, headersOnly=false (fetch the entire message).
  // Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
  // body to include along with the headers).  When headersOnly is false, the entire message
  // is fetched and numBodyLines is ignored.
  const bundle = new EmailBundle();

  try {
    await mailman.fetchRangeAsync(true, false, 0, 0, 4, bundle);
  } catch {
    console.log(mailman.lastErrorText);
    return;
  }

  const n = bundle.messageCount;
  console.log(`Fetched ${n} messages.`);

  const email = new Email();
  for (let i = 0; i < n; i++) {
    bundle.emailAt(i, email);
    console.log(email.subject);
  }

  // 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.
}