(Go) Bounced Email Handling

Demonstrates how to examine emails and detect which are bounced (automated) replies. Classifies each email according to the type of bounce.

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    bounce := chilkat.NewBounce()

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    mailman := chilkat.NewMailMan()

    // Set the POP3 server's hostname
    mailman.SetMailHost("mail.chilkatsoft.com")

    // Set the POP3 login/password.
    mailman.SetPopUsername("myLogin")
    mailman.SetPopPassword("myPassword")

    // Copy the all email from the user's POP3 mailbox 
    // into a bundle object.  The email remains on the server.
    // (There are other methods for deleting email from a POP3 server.)
    bundle := mailman.CopyMail()
    if mailman.LastMethodSuccess() == false {
        fmt.Println(mailman.LastErrorText())
        bounce.DisposeBounce()
        mailman.DisposeMailMan()
        return
    }

    i := 0
    // email is a Email
    for i < bundle.MessageCount() {
        email := bundle.GetEmail(i)

        success := bounce.ExamineEmail(email)
        if success == false {
            fmt.Println(bounce.LastErrorText())
            bundle.DisposeEmailBundle()
            bounce.DisposeBounce()
            mailman.DisposeMailMan()
            return
        }

        if bounce.BounceType() == 1 {
            // Hard bounce, log the email address
            fmt.Println("Hard Bounce: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 2 {
            // Soft bounce, log the email address
            fmt.Println("Soft Bounce: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 3 {
            // General bounce, no email address available.
            fmt.Println("General Bounce: No email address")
        }

        if bounce.BounceType() == 4 {
            // General bounce, log the email address
            fmt.Println("General Bounce: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 5 {
            // Mail blocked, log the email address
            // A bounce occured because the sender was blocked. 
            fmt.Println("Mail Blocked: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 6 {
            // Auto-reply, log the email address
            fmt.Println("Auto-Reply: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 7 {
            // Transient (recoverable) Failure, log the email address
            fmt.Println("Transient Failure: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 8 {
            // Subscribe request, log the email address
            fmt.Println("Subscribe Request: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 9 {
            // Unsubscribe Request, log the email address
            fmt.Println("Unsubscribe Request: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 10 {
            // Virus Notification, log the email address
            fmt.Println("Virus Notification: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 11 {
            // Suspected bounce.
            // This should be rare.  It indicates that the Bounce
            // component found strong evidence that this is a bounced
            // email, but couldn't quite recognize everything it
            // needed to be 100% sure.  Feel free to notify
            // support@chilkatsoft.com regarding emails having this
            // bounce type.
            fmt.Println("Suspected Bounce!")
        }

        if bounce.BounceType() == 12 {
            // Challenge/Response - Auto-reply message sent by SPAM software 
            // where only verified email addresses are accepted. 
            fmt.Println("Challenge: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 13 {
            // Address Change Notification Message.
            fmt.Println("Address Change: ", bounce.BounceAddress())
        }

        if bounce.BounceType() == 14 {
            // Success DSN indicating that the message was successfully relayed.
            fmt.Println("DSN Successful Relay: ")
        }

        email.DisposeEmail()

        i = i + 1
    }

    bundle.DisposeEmailBundle()

    success = mailman.Pop3EndSession()

    bounce.DisposeBounce()
    mailman.DisposeMailMan()