Qt5基于smtp服务发送电子邮件

1、设置邮箱

先登录163邮箱，然后在邮箱界面找到设置，在里面开通smtp服务。

这一步比较关键，要开通smtp服务，在开通的过程中会让你输入一个邮箱客户端授权码，这个才是你后面要用到的密码，而不是你登陆邮箱的密码；

 2. telnet命令发送邮件

打开cmd.

1. 输入 telnet smtp.163.com 25 回车

我试验了好几个邮箱服务器,大都有严厉的反垃圾邮件系统,导致邮件发不出去,幸好163的邮箱竟然可以.TX威武呀.smtp的协议端口为25.

2. 输入 HELO smtp.163.com 回车

我搜集的一些资料中既有使用helo又有使用ehlo的,结果还使我纠结了好久,后来又google才知道,原来都可以.这句应该是与服务器打招呼.如果返回250表示服务器准备就绪,可以进行下一步了.

3. 输入 AUTH LOGIN 回车

这是指定登录的模式,这句应该是一般模式.返回334就可以进行下一步了.

4. 输入 经过base64加密的你的账户名,比如你的邮箱账号号是xxxxxx@163.com,就去百度下 base64加密这个邮箱账号（是加密整个邮箱账号）,copy到命令行回车返回334

5.输入对应的授权码（base64加密这个授权码），注意是163邮箱的授权码，不是密码。回复235 Authentication successful表示验证通过,可以进行下一步了.

6. 输入 mail from:<xxxxxx@163.com> 这里写你的163邮箱，服务器返回250.

7. 输入 rcpt to:<xxxxxx@qq.com> 这里写你要发送给的qq邮箱，服务器返回250,下一步

8. 输入 data，表示开始传送数据,服务器返回354

9. 输入 subject:你的主题此处服务器无回显

10. 输入 此处什么也不用写,直接回车换行,作为主题与正文的分界此处服务器无回显

11. 输入 在这里写你的正文就可以了此处服务器也无回显

12. 输入 .对,就是一个英文句号,表示数据传送完毕,服务器返回250

13. 输入 quit服务器返回221,就安了,完成了,看看邮件收到了没.

整个过程入下图所示：

 qt代码如下：

mailtest.pro

#-------------------------------------------------

#

# Project created by QtCreator 2019-07-08T10:30:13

#

#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = mailtest

TEMPLATE = app

# The following define makes your compiler emit warnings if you use

# any feature of Qt which as been marked as deprecated (the exact warnings

# depend on your compiler). Please consult the documentation of the

# deprecated API in order to know how to port your code away from it.

DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.

# In order to do so, uncomment the following line.

# You can also select to disable deprecated APIs only up to a certain version of Qt.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += main.cpp

        mainwindow.cpp 

    smth.cpp

HEADERS  += mainwindow.h 

    smth.h

FORMS    += mainwindow.ui

QT += network

smtp.h

#ifndef SMTH_H

#define SMTH_H

#include<QByteArray>

#include<QString>

#include<QTcpSocket>

class Smtp

{

public:

    Smtp(QByteArray username,QByteArray password);

    ~Smtp();

    void send(QByteArray recvaddr,QString subject,QString content);

private:

    QTcpSocket * clientsocket;

    QByteArray username;

    QByteArray password;

    QByteArray recvaddr;

    QByteArray mailfrom = "mail from:<";

    QByteArray rcptto = "rcpt to:<";

    QByteArray prefrom = "from:";

    QByteArray preto = "to:";

    QByteArray presubject ="subject:";

    QString subject;                //主题

    QString content;                //发送内容

    QByteArray recvdata;            //接收到的数据

};

#endif // SMTH_H

smtp.cpp

#include "smth.h"

#include<qDebug>

Smtp::Smtp(QByteArray username,QByteArray password)

{

    if(username.contains("@163"))

    {

        this->username = username;

        this->password = password;

    }

    else

        qDebug()<<"NOT 163";

}

void Smtp::send(QByteArray recvaddr,QString subject,QString content)

{

    this->recvaddr = recvaddr;

    this->subject = subject;

    this->content = content;

    QByteArray usernametmp = this->username;

    QByteArray recvaddrtmp = this->recvaddr;

    clientsocket=new QTcpSocket();

    this->clientsocket->connectToHost("smtp.163.com",25,QTcpSocket::ReadWrite);

    this->clientsocket->waitForConnected(1000);

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    this->clientsocket->write("HELO smtp.163.com
");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    this->clientsocket->write("AUTH LOGIN
");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    qDebug()<<"username:"<<username;

    this->clientsocket->write(username.toBase64().append("
"));

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    qDebug()<<"password:"<<password;

    this->clientsocket->write(password.toBase64().append("
"));

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    this->clientsocket->write(mailfrom.append(usernametmp.append(">
")));

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    //发送邮箱

    //qDebug()<<"mail from:"<<mailfrom.append(usernametmp.append(">
"));

    this->clientsocket->write(rcptto.append(recvaddrtmp.append(">
")));

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    //接收邮箱

    //qDebug()<<"rcp to:"<<rcptto.append(recvaddrtmp.append(">
"));

    //data表示开始传输数据

    this->clientsocket->write("data
");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    usernametmp = this->username;

    recvaddrtmp = this->recvaddr;

    this->clientsocket->write(prefrom.append(usernametmp.append("
")));

    this->clientsocket->write(preto.append(recvaddrtmp.append("
")));

    this->clientsocket->write(presubject.append(subject.toLocal8Bit().append("
")));

    this->clientsocket->write("
");

    this->clientsocket->write(content.toLocal8Bit().append("
"));

    this->clientsocket->write(".
");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    this->clientsocket->write("quit
");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

}

Smtp::~Smtp()

{

    delete this->clientsocket;

}

main.cpp

#include "mainwindow.h"

#include <QApplication>

#include "smth.h"

int main(int argc, char *argv[])

{

    Smtp smtp("feigenchen@163.com","xxxxxx"); //邮箱和密码都要用自己的

    smtp.send("774367088@qq.com","测试smpt","这个是我写的代码给你发的邮件哈哈哈哈哈哈哈哈哈^_^"); 

    return 0;

}

希望对各位有所帮助
参考网址：https://www.cnblogs.com/chunfeng0060/p/6135089.html
参考网址：https://blog.csdn.net/wangdeyu1994/article/details/78693427