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Download the Full Version of a Partial Email

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Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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    success := false

    //  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
    //  header-only or partial Email and stores it in a second Email.  The full result includes
    //  the complete body and any attachments.  The partial email must retain its UIDL.

    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")

    //  First fetch message 1 as headers only (a fast preview).  headerOnly=true.
    partialEmail := chilkat.NewEmail()

    success = mailman.FetchOne(true,0,1,partialEmail)
    if success == false {
        fmt.Println(mailman.LastErrorText())
        mailman.DisposeMailMan()
        partialEmail.DisposeEmail()
        return
    }

    fmt.Println("Preview subject: ", partialEmail.Subject())

    //  Now download the complete message (body and attachments).
    fullEmail := chilkat.NewEmail()
    success = mailman.FetchFull(partialEmail,fullEmail)
    if success == false {
        fmt.Println(mailman.LastErrorText())
        mailman.DisposeMailMan()
        partialEmail.DisposeEmail()
        fullEmail.DisposeEmail()
        return
    }

    fmt.Println("Full email NumAttachments: ", fullEmail.NumAttachments())

    //  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()
    partialEmail.DisposeEmail()
    fullEmail.DisposeEmail()