var smtpSession = MCOSMTPSession()
        smtpSession.hostname = ""
        smtpSession.username = ""
        smtpSession.password = ""
        smtpSession.timeout = 5
        smtpSession.port = UInt32(port!)!
        smtpSession.authType = MCOAuthType.saslPlain
        smtpSession.connectionType = MCOConnectionType.startTLS
        smtpSession.connectionLogger = {(connectionID, type, data) in
            if data != nil {
                if let string = NSString(data: data!, encoding: String.Encoding.utf8.rawValue){
                    NSLog("Connectionlogger: \(string)")
                }
            }
        }

        var builder = MCOMessageBuilder()
        builder.header.to = [MCOAddress(displayName: "Some Receiver Name", mailbox: "receiver@abc.com")]
        builder.header.from = MCOAddress(displayName: "Some Sender Name", mailbox: "sender@abc.com")
        builder.header.subject = "Some Heading"
        builder.htmlBody = "<h1>heading</h1>"
        builder.textBody = "Some Text"

        let rfc822Data = builder.data()
        let sendOperation = smtpSession.sendOperation(with: rfc822Data)
        sendOperation?.start { (error) -> Void in
            if (error != nil) {
                print("Error sending email: \(error)")


            } else {
                print("Mail Sent")
            }
        }