Qt5基於smtp服務發送電子郵件

1、設置郵箱

先登錄163郵箱，然后在郵箱界面找到設置，在里面開通smtp服務。

這一步比較關鍵，要開通smtp服務，在開通的過程中會讓你輸入一個郵箱客戶端授權碼，這個才是你后面要用到的密碼，而不是你登陸郵箱的密碼；

 2. telnet命令發送郵件

打開cmd.

1. 輸入 telnet smtp.163.com 25 回車

我試驗了好幾個郵箱服務器,大都有嚴厲的反垃圾郵件系統,導致郵件發不出去,幸好163的郵箱竟然可以.TX威武呀.smtp的協議端口為25.

2. 輸入 HELO smtp.163.com 回車

我搜集的一些資料中既有使用helo又有使用ehlo的,結果還使我糾結了好久,后來又google才知道,原來都可以.這句應該是與服務器打招呼.如果返回250表示服務器准備就緒,可以進行下一步了.

3. 輸入 AUTH LOGIN 回車

這是指定登錄的模式,這句應該是一般模式.返回334就可以進行下一步了.

4. 輸入 經過base64加密的你的賬戶名,比如你的郵箱賬號號是[e-mail],就去百度下 base64加密這個郵箱賬號（是加密整個郵箱賬號）,copy到命令行回車返回334

5.輸入對應的授權碼（base64加密這個授權碼），注意是163郵箱的授權碼，不是密碼。回復235 Authentication successful表示驗證通過,可以進行下一步了.

6. 輸入 mail from:<[e-mail]> 這里寫你的163郵箱，服務器返回250.

7. 輸入 rcpt to:<[e-mail]> 這里寫你要發送給的qq郵箱，服務器返回250,下一步

8. 輸入 data，表示開始傳送數據,服務器返回354

9. 輸入 subject:你的主題此處服務器無回顯

10. 輸入 此處什么也不用寫,直接回車換行,作為主題與正文的分界此處服務器無回顯

11. 輸入 在這里寫你的正文就可以了此處服務器也無回顯

12. 輸入 .對,就是一個英文句號,表示數據傳送完畢,服務器返回250

13. 輸入 quit服務器返回221,就安了,完成了,看看郵件收到了沒.

整個過程入下圖所示：

 

 qt代碼如下：

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;                //主題

    QString content;                //發送內容

    QByteArray recvdata;            //接收到的數據

};

#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\r\n");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    this->clientsocket->write("AUTH LOGIN\r\n");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

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

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

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

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

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

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

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

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    //發送郵箱

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

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

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    //接收郵箱

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

    //data表示開始傳輸數據

    this->clientsocket->write("data\r\n");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    usernametmp = this->username;

    recvaddrtmp = this->recvaddr;

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

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

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

    this->clientsocket->write("\r\n");

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

    this->clientsocket->write(".\r\n");

    this->clientsocket->waitForReadyRead(1000);

    recvdata = clientsocket->readAll();

    qDebug()<<recvdata;

    this->clientsocket->write("quit\r\n");

    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("[e-mail]","xxxxxx"); //郵箱和密碼都要用自己的

    smtp.send("[e-mail]","測試smpt","這個是我寫的代碼給你發的郵件哈哈哈哈哈哈哈哈哈^_^"); 

    return 0;

}

希望對各位有所幫助
參考網址：https://www.cnblogs.com/chunfeng0060/p/6135089.html
參考網址：https://blog.csdn.net/wangdeyu1994/article/details/78693427