Java

Get the Size of a POP3 Message by UIDL

Demonstrates the Chilkat MailMan.GetSizeByUidl method, which returns the size, in bytes, of the email on the POP3 server identified by a UIDL. The size includes the full message content, including attachments, and the method returns -1 on error. This example looks up a message's size by its UIDL.

Background: A UIDL ("unique ID listing") is POP3's stable identifier for a message — it stays the same across sessions as long as the message remains in the mailbox. Checking a message's size before downloading lets a client skip or defer very large messages, enforce size limits, or show a progress estimate. You can obtain the available UIDLs from GetMailboxInfoXml or FetchUidls.

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import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the MailMan.GetSizeByUidl method, which returns the size, in bytes, of the
        // email on the POP3 server identified by a UIDL.  The size includes the full message
        // content, including attachments.  Returns -1 on error.

        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");

        // Get the size of a specific message by its UIDL.
        int sizeBytes = mailman.getSizeByUidl("0000000123abcdef");
        System.out.println("Message size (bytes): " + sizeBytes);

        // 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.
    }
}