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Go

Fetch a Range of POP3 Messages

See more POP3 Examples

Demonstrates the Chilkat MailMan.FetchRange method, which retrieves a range of messages from the POP3 mailbox and appends them to an EmailBundle. The arguments are keepOnServer, headersOnly, numBodyLines, a zero-based inclusive startIndex and endIndex, and the EmailBundle. This example fetches the first five messages.

Background: Fetching a range instead of everything is useful for paging through a large mailbox, or resuming after an interruption — download messages 0–99, then 100–199, and so on. Combined with headersOnly, it lets you build a quick message-list view without pulling full bodies and attachments up front.

Chilkat Go Downloads

Go
    success := false

    //  Demonstrates the MailMan.FetchRange method, which retrieves a range of messages from the
    //  POP3 mailbox and appends them to an EmailBundle.  The arguments are keepOnServer,
    //  headersOnly, numBodyLines, startIndex, endIndex, and the EmailBundle.  The indexes are
    //  zero-based and inclusive.

    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")

    //  Fetch the first 5 messages (indexes 0 through 4), full bodies, leaving them on the server.
    //  keepOnServer=true, headersOnly=false (fetch the entire message).
    //  Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
    //  body to include along with the headers).  When headersOnly is false, the entire message
    //  is fetched and numBodyLines is ignored.
    bundle := chilkat.NewEmailBundle()

    success = mailman.FetchRange(true,false,0,0,4,bundle)
    if success == false {
        fmt.Println(mailman.LastErrorText())
        mailman.DisposeMailMan()
        bundle.DisposeEmailBundle()
        return
    }

    n := bundle.MessageCount()
    fmt.Println("Fetched ", n, " messages.")

    email := chilkat.NewEmail()
    var i int
    for i = 0; i <= n - 1; i++ {
        success = bundle.EmailAt(i,email)
        fmt.Println(email.Subject())
    }

    //  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()
    bundle.DisposeEmailBundle()
    email.DisposeEmail()