我正在尝试用Go连接IMAP服务器，我可以用openssl连接并发出命令：

openssl s_client -crlf -connect mail.privateemail.com:993
CONNECTED(00000003)
[...]
test LOGIN myuser@email.com myp4ssw0rd
test OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SNIPPET=FUZZY PREVIEW=FUZZY PREVIEW STATUS=SIZE SAVEDATE SEARCH=X-MIMEPART XDOVECOT LITERAL+ NOTIFY METADATA SPECIAL-USE QUOTA ACL RIGHTS=texk] Logged in

然而，当我在Go语言中尝试同样的方法时，我只从IMAP服务器得到了登录前的消息。

func main() {
    conn, err := tls.Dial("tcp", "mail.privateemail.com:993", nil)
    if err != nil {
        log.Println(err.Error())
    }

    defer conn.Close()

    n, err := conn.Write([]byte("test LOGIN \"myuser@email.com\" \"myp4ssw0rd\"\n"))
    if err != nil {
        log.Println(n, err.Error())
    }

    buf := make([]byte, 1000)
    n, err = conn.Read(buf)
    if err != nil {
        log.Println(n, err)
        return
    }

    log.Println(string(buf))
}

它将生成以下输出：

go run main.go
2023/02/09 10:06:12 * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN AUTH=LOGIN] Dovecot ready.

要使用*tls.Conn向IMAP服务器发送命令，我需要做什么？