tls：第一个记录看起来不像TLS握手

Question

我尝试使用go和sendgrid发送ssl电子邮件，而我遇到了此错误的一个问题：

2019/06/18 19:40:25 tls: first record does not look like a TLS handshake
panic: tls: first record does not look like a TLS handshake
    /Users/admin/go/src/github.com/username/emailsender/sendme/sshMailer/smtp-sender.go:15 +0xace
main.sendEmail(0x2, 0x7fffd822f795, 0x11, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc00022c3c0, 0xc00023e240)
    emailsender/easysend.go:87 +0x7ba
main.worker(0xc00023e240, 0xc00022c3c0, 0xc000220220)
    emailsender/easysend.go:110 +0xfa
created by main.main
    emailsender/easysend.go:209 +0x418 

我当前的代码是这样的：

01: // SmtpSendOne - send email using smtp & proxy
02: func SmtpSendOne(server SmtpServer, data *MailData) error {
03: 
04:     var remote net.Conn
05:     var err error
06: 
07:     
08: 
09:     // TLS config
10:     tlsconfig := &tls.Config{
11:         InsecureSkipVerify: true,
12:         ServerName:         server.Host,
13:     }
14: 
15:     remote, err := tls.Dial("tcp", server.GetHostFull(), tlsconfig)
16:     if err != nil {
17:         log.Panic(err)
18:     }
19:     defer remote.Close()
20: 
21:     if err != nil {
22:         return fmt.Errorf("Failed to connect to SMTP server: %s", err)
23:     }
24: 

我如何解决此错误？ tls: first record does not look like a TLS handshake吗？