SMTP连接读取欢迎消息 [英] SMTP connection read welcome message

问题描述

我尝试连接到smtp服务器并阅读欢迎消息。这是我的代码：

I try to connect on smtp server and read welcome message. This is my code:

package main

import (
    "fmt"
    "net"
    "time"
    "net/smtp"
    "bufio"
)

func main() {
    // attempt a connection
    conn, _ := net.DialTimeout("tcp", "88.198.24.108:25", 15 * time.Second)

    buf := bufio.NewReader(conn)
    bytes, _ := buf.ReadBytes('\n')
    fmt.Printf("%s", bytes)


    client, err := smtp.NewClient(conn, "88.198.24.108")
    if err != nil {
        fmt.Println("1>>", err)
        return
    }

    client.Quit()
    conn.Close()
}

问题是在读取欢迎消息停止运行并等待超时，我想读取/打印欢迎消息并继续。

Problem is after read welcome message stop running and wait to go in timeout, I want to read/print welcome message and continue.

220 example.me ESMTP Haraka/2.8.18 ready
1>> 421 timeout

推荐答案

func NewClient(conn net.Conn, host string) (*Client, error) {
    text := textproto.NewConn(conn)
    _, _, err := text.ReadResponse(220)
    if err != nil {
        text.Close()
        return nil, err
    }
    c := &Client{Text: text, conn: conn, serverName: host, localName: "localhost"}
    _, c.tls = conn.(*tls.Conn)
    return c, nil
}

您需要阅读此横幅并根据其内容决定是否发送邮件。

You want to read this banner and decide whether to send mail based on its contents.

由于您已经自己阅读了横幅，并且可能会对此做出决定，而不是调用 smtp.NewClient（），您应该执行其余的 NewClient（）在你自己的代码中，可能是这样的：

Since you have already read the banner yourself, and presumably will make a decision on that, instead of calling smtp.NewClient() you should then implement the rest of NewClient() in your own code, possibly something like this:

    client := &smtp.Client{Text: text, conn: conn, serverName: host, localName: "localhost"}
    _, client.tls = conn.(*tls.Conn)

这篇关于SMTP连接读取欢迎消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！