"github.com/emersion/go-imap/client"
    "github.com/emersion/go-imap"

    var serverport, username, password string

    reader := bufio.NewReader(os.Stdin)

    log.Println("Connecting to server...")
    // Connect to server
    // c, err := client.DialTLS("mail.example.org:993", nil)
    fmt.Printf("server:port> ")
    serverport, _ = reader.ReadString('\n')
    fmt.Printf("connecting to: %s...\n", serverport)
    c, err := client.DialTLS(serverport, nil)
    if err != nil {
            log.Fatal(err)
    }
    log.Println("Connected")

    // Don't forget to logout
    defer c.Logout()

    // Login
    // if err := c.Login("username", "password"); err != nil {
    fmt.Printf("username: ")
    username, _ = reader.ReadString('\n')
    fmt.Printf("password: ")
    password, _ = reader.ReadString('\n')
    fmt.Printf("logging in as: %s...\n", username)
    if err := c.Login(username, password); err != nil {
            log.Fatal(err)
    }
    log.Println("Logged in")

    // List mailboxes
    mailboxes := make(chan *imap.MailboxInfo, 10)
    done := make(chan error, 1)
    go func () {
            done <- c.List("", "*", mailboxes)
    }()

    log.Println("Mailboxes:")
    for m := range mailboxes {
            log.Println("* " + m.Name)
    }

    if err := <-done; err != nil {
            log.Fatal(err)
    }

    // Select INBOX
    mbox, err := c.Select("INBOX", false)
    if err != nil {
            log.Fatal(err)
    }
    log.Println("Flags for INBOX:", mbox.Flags)

    // Get the last 4 messages
    from := uint32(1)
    to := mbox.Messages
    if mbox.Messages > 3 {
            // We're using unsigned integers here, only substract if the result is > 0
            from = mbox.Messages - 3
    }
    seqset := new(imap.SeqSet)
    seqset.AddRange(from, to)

    messages := make(chan *imap.Message, 10)
    done = make(chan error, 1)
    go func() {
            done <- c.Fetch(seqset, []imap.FetchItem{imap.FetchEnvelope}, messages)
    }()

    log.Println("Last 4 messages:")
    for msg := range messages {
            log.Println("* " + msg.Envelope.Subject)
    }

    if err := <-done; err != nil {
            log.Fatal(err)
    }

    log.Println("Done!")