(Lianja) 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 Lianja Extension Download Chilkat Lianja Extension

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

loBounce = createobject("CkBounce")

// The mailman object is used for receiving (POP3) 
// and sending (SMTP) email.
loMailman = createobject("CkMailMan")

// Set the POP3 server's hostname
loMailman.MailHost = "mail.chilkatsoft.com"

// Set the POP3 login/password.
loMailman.PopUsername = "myLogin"
loMailman.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.)
loBundle = loMailman.CopyMail()
if (loMailman.LastMethodSuccess = .F.) then
    ? loMailman.LastErrorText
    release loBounce
    release loMailman
    return
endif

i = 0

do while i < loBundle.MessageCount
    loEmail = loBundle.GetEmail(i)

    llSuccess = loBounce.ExamineEmail(loEmail)
    if (llSuccess = .F.) then
        ? loBounce.LastErrorText
        release loBundle
        release loBounce
        release loMailman
        return
    endif

    if (loBounce.BounceType = 1) then
        // Hard bounce, log the email address
        ? "Hard Bounce: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 2) then
        // Soft bounce, log the email address
        ? "Soft Bounce: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 3) then
        // General bounce, no email address available.
        ? "General Bounce: No email address"
    endif

    if (loBounce.BounceType = 4) then
        // General bounce, log the email address
        ? "General Bounce: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 5) then
        // Mail blocked, log the email address
        // A bounce occured because the sender was blocked. 
        ? "Mail Blocked: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 6) then
        // Auto-reply, log the email address
        ? "Auto-Reply: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 7) then
        // Transient (recoverable) Failure, log the email address
        ? "Transient Failure: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 8) then
        // Subscribe request, log the email address
        ? "Subscribe Request: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 9) then
        // Unsubscribe Request, log the email address
        ? "Unsubscribe Request: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 10) then
        // Virus Notification, log the email address
        ? "Virus Notification: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 11) then
        // 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.
        ? "Suspected Bounce!"
    endif

    if (loBounce.BounceType = 12) then
        // Challenge/Response - Auto-reply message sent by SPAM software 
        // where only verified email addresses are accepted. 
        ? "Challenge: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 13) then
        // Address Change Notification Message.
        ? "Address Change: " + loBounce.BounceAddress
    endif

    if (loBounce.BounceType = 14) then
        // Success DSN indicating that the message was successfully relayed.
        ? "DSN Successful Relay: "
    endif

    release loEmail

    i = i + 1
enddo

release loBundle

llSuccess = loMailman.Pop3EndSession()


release loBounce
release loMailman