Java

Check the Number of Messages in a POP3 Mailbox

Demonstrates the Chilkat MailMan.CheckMail method, which returns the number of messages currently available in the POP3 mailbox, or -1 if an error occurs. If no POP3 session is active, Chilkat connects and authenticates automatically using the configured settings. This example configures the POP3 connection and checks the message count.

Background: POP3 (Post Office Protocol version 3) is the classic protocol for downloading mail from a server to a client. A client connects, authenticates with a username and password, and can then list, retrieve, or delete messages. Modern connections use implicit TLS on port 995 (PopSsl = true). CheckMail is a quick way to ask "how many messages are waiting?" without downloading any of them.

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import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the MailMan.CheckMail method, which returns the number of messages currently
        // available in the POP3 mailbox (or -1 if an error occurs).  If no POP3 session is active,
        // Chilkat connects and authenticates automatically using the configured settings.

        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");

        // Check the mailbox.  A return value of -1 indicates an error.
        int numMessages = mailman.checkMail();
        System.out.println("Number of messages in the mailbox: " + numMessages);

        // 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.
    }
}