Use an Existing Socket SSH Tunnel

See more SMTP Examples

Demonstrates the Chilkat MailMan.UseSshTunnel method, which configures MailMan to use an existing SSH tunnel provided by a Socket object for its SMTP and POP3 connections. This example opens and authenticates a tunnel on a Socket, hands it to MailMan, and then verifies an SMTP login through it.

Background: Sharing one already-established SSH tunnel across objects avoids opening (and authenticating) a separate SSH connection for every component that needs to reach the remote network. Here the tunnel lives on a Socket object, which MailMan then routes its SMTP/POP3 traffic through. It is the Socket-based sibling of UseSsh, which shares an Ssh object instead.

Chilkat Go Downloads

Download Chilkat for Go

    success := false

    //  Demonstrates the MailMan.UseSshTunnel method, which configures MailMan to use an existing
    //  SSH tunnel provided by a Socket object for its SMTP and POP3 connections.

    //  Open and authenticate the SSH tunnel using a Socket object.
    sshTunnel := chilkat.NewSocket()
    success = sshTunnel.SshOpenTunnel("ssh.example.com",22)
    if success == false {
        fmt.Println(sshTunnel.LastErrorText())
        sshTunnel.DisposeSocket()
        return
    }

    success = sshTunnel.SshAuthenticatePw("sshUser","sshPassword")
    if success == false {
        fmt.Println(sshTunnel.LastErrorText())
        sshTunnel.DisposeSocket()
        return
    }

    mailman := chilkat.NewMailMan()

    //  Configure the SMTP server connection.  These connections will travel through the tunnel.
    mailman.SetSmtpHost("smtp.example.com")
    mailman.SetSmtpPort(465)
    mailman.SetSmtpSsl(true)
    mailman.SetSmtpUsername("user@example.com")
    mailman.SetSmtpPassword("myPassword")

    //  Tell MailMan to route its connections through the existing tunnel.
    success = mailman.UseSshTunnel(sshTunnel)
    if success == false {
        fmt.Println(mailman.LastErrorText())
        sshTunnel.DisposeSocket()
        mailman.DisposeMailMan()
        return
    }

    //  SMTP operations now travel through the shared SSH tunnel.
    success = mailman.VerifySmtpLogin()
    if success == false {
        fmt.Println(mailman.LastErrorText())
        sshTunnel.DisposeSocket()
        mailman.DisposeMailMan()
        return
    }

    fmt.Println("Authenticated with the SMTP server through the SSH tunnel.")

    sshTunnel.DisposeSocket()
    mailman.DisposeMailMan()