(Swift 3,4,5...) Bounced Email Handling

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

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let bounce = CkoBounce()!

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    let mailman = CkoMailMan()!

    // Set the POP3 server's hostname
    mailman.mailHost = "mail.chilkatsoft.com"

    // Set the POP3 login/password.
    mailman.popUsername = "myLogin"
    mailman.popPassword = "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.)
    var bundle: CkoEmailBundle? = mailman.copyMail()
    if mailman.lastMethodSuccess == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    var i: Int = 0
    var email: CkoEmail?
    while i < bundle!.messageCount.intValue {
        email = bundle!.getEmail(i)

        var success: Bool = bounce.examine(email)
        if success == false {
            print("\(bounce.lastErrorText!)")
            bundle = nil
            return
        }

        if bounce.bounceType.intValue == 1 {
            // Hard bounce, log the email address
            print("Hard Bounce: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 2 {
            // Soft bounce, log the email address
            print("Soft Bounce: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 3 {
            // General bounce, no email address available.
            print("General Bounce: No email address")
        }

        if bounce.bounceType.intValue == 4 {
            // General bounce, log the email address
            print("General Bounce: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 5 {
            // Mail blocked, log the email address
            // A bounce occured because the sender was blocked. 
            print("Mail Blocked: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 6 {
            // Auto-reply, log the email address
            print("Auto-Reply: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 7 {
            // Transient (recoverable) Failure, log the email address
            print("Transient Failure: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 8 {
            // Subscribe request, log the email address
            print("Subscribe Request: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 9 {
            // Unsubscribe Request, log the email address
            print("Unsubscribe Request: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 10 {
            // Virus Notification, log the email address
            print("Virus Notification: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 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.
            print("Suspected Bounce!")
        }

        if bounce.bounceType.intValue == 12 {
            // Challenge/Response - Auto-reply message sent by SPAM software 
            // where only verified email addresses are accepted. 
            print("Challenge: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 13 {
            // Address Change Notification Message.
            print("Address Change: \(bounce.bounceAddress!)")
        }

        if bounce.bounceType.intValue == 14 {
            // Success DSN indicating that the message was successfully relayed.
            print("DSN Successful Relay: ")
        }

        email = nil

        i = i + 1
    }

    bundle = nil

    success = mailman.pop3EndSession()

}