Send email by SMTP

Saee1101

#include "smtp.h"

Smtp::Smtp( const QString &from, const QString &to, const QString &subject, const QString &body )
{
    socket = new QTcpSocket( this );

    connect( socket, SIGNAL( readyRead() ), this, SLOT( readyRead() ) );
    connect( socket, SIGNAL( connected() ), this, SLOT( connected() ) )
    connect(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)), this, SLOT(stateChanged()));
        connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(errorReceived()));
    connect(socket, SIGNAL(disconnected()), this, SLOT(disconnected()));


    message = "To: " + to + "\n";
    message.append("From: " + from + "\n");
    message.append("Subject: " + subject + "\n");
    message.append(body);
    message.replace( QString::fromLatin1( "\n" ), QString::fromLatin1( "\r\n" ) );
    message.replace( QString::fromLatin1( "\r\n.\r\n" ),
    QString::fromLatin1( "\r\n..\r\n" ) );
    this->from = from;
    rcpt = to;
    state = Init;
socket->connectToHost("smtp.gmail.com",465);

    if(socket->waitForConnected ( 30000 )) 	{qDebug("connected"); 	}

    t = new QTextStream( socket );
}
Smtp::~Smtp()
{
    delete t;
    delete socket;
}
void Smtp::stateChanged()
{

    qDebug() <<"stateChanged " ;
}

void Smtp::errorReceived()
{
    qDebug() << "errorReceived" ;
}

void Smtp::disconnected()
{

    qDebug() <<"disconneted";
    qDebug() << "error "  << socket->errorString();
}

void Smtp::connected()
{
    output->append("connected");
    qDebug() << "Connected ";
}

void Smtp::readyRead()
{

     qDebug() <<"readyRead";
    // SMTP is line-oriented

    QString responseLine;
    do
    {
        responseLine = socket->readLine();
        response += responseLine;
    }
    while ( socket->canReadLine() && responseLine[3] != ' ' );

    responseLine.truncate( 3 );


    if ( state == Init && responseLine[0] == '2' )
    {
        // banner was okay, let's go on

        *t << "HELO there\r\n";
        t->flush();

        state = Mail;
    }
    else if ( state == Mail && responseLine[0] == '2' )
    {
        // HELO response was okay (well, it has to be)

        *t << "MAIL FROM: " << from << "\r\n";
        t->flush();
        state = Rcpt;
    }
    else if ( state == Rcpt && responseLine[0] == '2' )
    {

        *t << "RCPT TO: " << rcpt << "\r\n"; //r
        t->flush();
        state = Data;
    }
    else if ( state == Data && responseLine[0] == '2' )
    {

        *t << "DATA\r\n";
        t->flush();
        state = Body;
    }
    else if ( state == Body && responseLine[0] == '3' )
    {

        *t << message << "\r\n.\r\n";
        t->flush();
        state = Quit;
    }
    else if ( state == Quit && responseLine[0] == '2' )
    {

        *t << "QUIT\r\n";
        t->flush();
        // here, we just close.
        state = Close;
        emit status( tr( "Message sent" ) );
    }
    else if ( state == Close )
    {
        deleteLater();
        return;
    }
    else
    {
        // something broke.
        QMessageBox::warning( 0, tr( "Qt Mail Example" ), tr( "Unexpected reply from SMTP server:\n\n" ) + response );
        state = Close;
    }
    response = "";
}

QString Smtp::base64Encode(const QString &plainText)
{
    QByteArray textBytes = plainText.toUtf8();
     QByteArray encodedBytes = textBytes.toBase64();
     return QString(encodedBytes);
}

Hi, everybody. I don't know where And how get sender email password ?

JonB

@Saee1101
Thanks for just deleting your previous same topic after I tried to help.

Sample code at https://github.com/bluetiger9/SmtpClient-for-Qt. Test that, then grab just the bits you want from it if you want to do it yourself/keep code small.
You might also find https://morf.lv/simple-tls-ssl-smtp-client-for-qt5 useful.

You will need to set up to use Qt SSL support since you are using port 465.

I don't know what you have to do these days to connect successfully to their server (assuming you don't want to do OAuth programming). I have a feeling you need to be logged into your Google account but not sure. And you used to have to enable programmatic sending in your gmail account, don't know if that still applies. You will be providing your gmail username and password.

Volker75

@JonB If you want to know what you need to setup in gmail, then watch my video:
https://www.youtube.com/watch?v=c9jdrQ8uTes

JonB

@Volker75 I don't want to know anything, I have set up in the past. The question is whether @Saee1101 needs to know anything like this....

Volker75

@JonB
Ah. ok. No problem.
If (You want to know == false) { just skip reading }

:-)

Saee1101

@JonB I'm so sorry . I am confused about previous topic , thank you.
I have gmail account and active security for access to send email .
but I don't know get gmail password ?

JonB

@Saee1101
I don't know what you mean by "get gmail password"? To send email via Gmail SMTP you would need to send your gmail address and your password. I don't know what your password is, only you do. I am unsure whether if you are currently logged into gmail that would mean you do not need to send your username/password.

Volker75

@JonB No, you must NOT send your password. Watch my video. You need to create an extra password for your application. Using YOUR password doesn't work with google anymore.

JonB

@Volker75
Hi. I am sure your information is useful, and OP should try your video. I am sorry but I do not watch any videos, if your was a text/code post I would happily read it. I do now vaguely remember about creating a password at Google side, Is this all to do with https://forum.qt.io/topic/134839/gmail-smtp-authentication/17 ?

But in order to keep the functionality you have now, you need to enable 2FA and generate the "less secure app" credentials. That's the scope of the changes you face, if I read the situation correctly.

If you want to guide this OP through what he has to do at the Qt side programatically at the client (in addition to set up at Gmail side), please do so!

Volker75

@JonB No problem. Yes, I am showing in the video how to create a new password and how to enable the 2FA. It is pretty hidden in the google settings. Difficult to explain with text only. You can see it in a video much better.
In the c++ source it is easy. I also just use that simple-mail GitHub repository. The manual there is short and easy. Enabling the 2FA on google took me the most time.

Saee1101

I did set password and 2FA for from@gmail.com

Smtp *newmail=new Smtp("from@gmail.com","to@gmail.com","Test","Hi,I'm QtCreator");

I'm sure enter password for "from@gmail.com" . but I don't know how do it ?

Volker75

@Saee1101 Just by

newmail.setPassword(password);

Saee1101

@Volker75

#ifndef SMTP_H
#define SMTP_H

#include <QTcpSocket>
#include <QString>
#include <QTextStream>
#include <QDebug>
#include <QMessageBox>
#include <QTextEdit>

class Smtp : public QObject
{
    Q_OBJECT


public:
    Smtp( const QString &from, const QString &to,
    const QString &subject, const QString &body );
    ~Smtp();
QString base64Encode(const QString &plainText);
signals:
    void status( const QString &);

public slots:
    void stateChanged();
    void errorReceived();
    void disconnected();
    void connected();
    void readyRead();

private:
    QString message;
    QTextStream *t;
    QTcpSocket *socket;
    QString from;
    QString rcpt;
    QString response;
     QTextEdit *output;
    enum states{Rcpt,Mail,Data,Init,Body,Quit,Close};
    int state;

};
#endif

do you see setPassword ?!

Volker75

@Saee1101 Well, you should
#include "../../src/SmtpMime"

Did you saw the "demo" folder? Check out demo4.cpp and do it exactly like that.

Saee1101

This post is deleted!

Saee1101

@Volker75
I do Enable POP for all mail or Enable POP for mail that arrives from now on. Screenshot 1.png
Application Output :

host : "smtp.gmail.com"
port : 587
ssl : false
auth : false
user : "test.tivanex@gmail.com"
password : "nkjs **** **** ****"
[SmtpClient] State: ConnectingState
[Socket] State: QAbstractSocket::HostLookupState
[Socket] State: QAbstractSocket::ConnectingState
[Socket] State: QAbstractSocket::ConnectedState
[SmtpClient] State: ConnectedState
[Socket] IN:  "220 smtp.gmail.com ESMTP ti10-20020a170907c20a00b00a360ba43173sm370123ejc.99 - gsmtp\r\n"
[SmtpClient] State: _EHLO_State
[Socket] OUT: "EHLO localhost"
[Socket] IN:  "250-smtp.gmail.com at your service, [109.125.166.7]\r\n"
[Socket] IN:  "250-SIZE 35882577\r\n"
[Socket] IN:  "250-8BITMIME\r\n"
[Socket] IN:  "250-STARTTLS\r\n"
[Socket] IN:  "250-ENHANCEDSTATUSCODES\r\n"
[Socket] IN:  "250-PIPELINING\r\n"
[Socket] IN:  "250-CHUNKING\r\n"
[Socket] IN:  "250 SMTPUTF8\r\n"
[SmtpClient] State: _READY_Connected
[SmtpClient] State: ReadyState
[SmtpClient] State: MailSendingState
[SmtpClient] State: _MAIL_0_FROM
[Socket] OUT: "MAIL FROM:<test.tivanex@gmail.com>"
[Socket] IN:  "530-5.7.0 Must issue a STARTTLS command first. For more information, go to\r\n"
[Socket] IN:  "530-5.7.0  https://support.google.com/a/answer/3221692 and review RFC 3207\r\n"
[Socket] IN:  "530 5.7.0 specifications. ti10-20020a170907c20a00b00a360ba43173sm370123ejc.99 - gsmtp\r\n"
QWindowsWindow::setGeometry: Unable to set geometry 120x30+805+451 (frame: 136x69+797+420) on QWidgetWindow/"QErrorMessageClassWindow" on "\\.\DISPLAY1". Resulting geometry: 203x124+805+451 (frame: 219x163+797+420) margins: 8, 31, 8, 8 minimum size: 203x124 MINMAXINFO maxSize=0,0 maxpos=0,0 mintrack=219,163 maxtrack=0,0)

Help me ,please
Help me ,please
Help me ,please

JonB

@Saee1101 said in Send email by SMTP:

Help me ,please
Help me ,please
Help me ,please

?

Have you acted on what the output error message tells you that you need to do, to send mail via this server?

Saee1101

@JonB
NO , I don't know what to do , actually ?

JonB

@Saee1101

530-5.7.0 Must issue a STARTTLS command first.

The server is telling you that you are trying to send a message unencrypted, but it requires encryption and won't just send in plain text. You can see from earlier that one of the commands it accepts is STARTTLS, and you need to issue that from your client.

I can't recall the details, you may wait for other responses. But I think after you send the initial EHLO greeting you then send a STARTTLS. And then I think you have to set up to use SSL socket. An example is at https://stackoverflow.com/questions/34215231/send-email-with-starttls, it's for Java but you get the idea. I'm sure you can get a better one by Googling for smtp starttls example, e.g. https://stackoverflow.com/questions/22957189/smtp-send-mail-with-qtcpsocket for Qt. If you looked at/are using https://github.com/bluetiger9/SmtpClient-for-Qt I see that mentions it has support for STARTTLS.