Java

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;
import com.chilkatsoft.chilkat2.EmailBundle;
import com.chilkatsoft.chilkat2.MailMan;
import com.chilkatsoft.chilkat2.StringTable;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
        // listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
        // StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
        // server.

        MailMan mailman = new MailMan();

        // Configure the POP3 server connection.
        mailman.setMailHost("pop.example.com");
        mailman.setMailPort(995);
        mailman.setPopSsl(true);
        mailman.setPopUsername("user@example.com");
        mailman.setPopPassword("myPassword");

        // Build the set of UIDLs to fetch.
        StringTable uidls = new StringTable();
        uidls.append("0000000123abcdef");
        uidls.append("0000000124abcdef");

        // Fetch the listed messages (full bodies) into a bundle.
        // 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.
        EmailBundle bundle = new EmailBundle();

        try {
            mailman.fetchUidlSet(uidls, false, 0, bundle);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        int n = bundle.getMessageCount();
        System.out.println("Fetched " + n + " messages.");

        Email email = new Email();
        for (int i = 0; i < n; i++) {
            bundle.emailAt(i, email);
            System.out.println(email.getSubject());
        }

        // 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.
    }
}