Check the Number of Messages in a POP3 Mailbox

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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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    //  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 := chilkat.NewMailMan()

    //  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.
    numMessages := mailman.CheckMail()
    fmt.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.

    mailman.DisposeMailMan()