Sending Mail

**systemz89** · 9th December 2007, 10:18

Hello...
How can I send an e-mail from a QT4 application? Don't write the code, please explain it me how... I stopped where I can't find any QT4 Class which helps me

Thanks, systemz89

**wysota** · 9th December 2007, 10:29

There is no class for smtp. I remember writing a simple similar class for pop3, so that's not a big deal to do it for smtp as well. And there are non-Qt classes for sending mails through smtp - you might use them.

**systemz89** · 9th December 2007, 10:37

Originally Posted by wysota

There is no class for smtp. I remember writing a simple similar class for pop3, so that's not a big deal to do it for smtp as well. And there are non-Qt classes for sending mails through smtp - you might use them.

And where can I find some non-Qt classes?
And what about QTcpSocket (QNetwork module) class?

**wysota** · 9th December 2007, 11:33

You can use QTcpSocket, but it's just a socket - you need to implement the whole smtp protocol yourself. As for the classes - ask google

**systemz89** · 9th December 2007, 11:47

I find on the internet a source code:

Qt Code:

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#ifndef SMTP_H
#define SMTP_H
 
#include <QApplication>
#include <QMessageBox>
#include <QtDebug>
#include <QString>
#include <QObject>
#include <QTcpSocket>
#include <QTextStream>
 
class Smtp : public QObject
{
    Q_OBJECT
 
public:
    Smtp( const QString &from, const QString &to,  const QString
&subject, const QString &body );
    ~Smtp();
 
signals:
    void status( const QString & );
 
private slots:
    void readyRead();
    void connected();
 
	void stateChanged( QAbstractSocket::SocketState socketState );
	void errorReceived( QAbstractSocket::SocketError socketError );
	void disconnected();
 
private:
    enum State {
	Init,
	Mail,
	Rcpt,
	Data,
	Body,
	Quit,
	Close
    };
 
    QString message;
    QString from;
    QString rcpt;
    QTcpSocket * socket;
    QTextStream * t;
    int state;
    QString response;
};
 
 
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( error( QAbstractSocket::SocketError) ),
this, SLOT( errorReceived( QAbstractSocket::SocketError ) ) );   
    connect( socket, SIGNAL( stateChanged( QAbstractSocket::SocketState)
), this, SLOT( stateChanged( QAbstractSocket::SocketState ) ) );       
    connect( socket, SIGNAL( disconnectedFromHost()), this,
SLOT(disconnected() ) ); 
    message = QString::fromLatin1( "From: " ) +from
+QString::fromLatin1( "\nTo: " ) +to +QString::fromLatin1( "\nSubject: "
) +subject +QString::fromLatin1( "\n\n" ) +body +"\n";
    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;
 
	// change this to correct email server address
    socket->connectToHost( "xx.xx.xx.xxx", 25 );
 
	if( socket->waitForConnected( 30000 ) )
		qDebug()("connected");   
 
    t = new QTextStream( socket );   
}
 
Smtp::~Smtp()
{
    delete t;
    delete socket;
}
void Smtp::stateChanged( QAbstractSocket::SocketState socketState)
{
    qDebug() <<"stateChanged " << socketState;
}
 
void Smtp::errorReceived( QAbstractSocket::SocketError socketError)
{
    qDebug() << "error " <<socketError;
}
 
void Smtp::disconnected()
{
	qDebug() <<"disconneted";
	qDebug() << "error "  << socket->errorString();
}
 
void Smtp::connected()
{
    qDebug() << "Connected ";
}
 
void Smtp::readyRead()
{   
	if( !socket->canReadLine() )
		return;
 
	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' )
    {
        // HELLO 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";
		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";
		t->flush();
        state = Quit;
    }
    else if ( state == Quit && responseLine[0] == '2' )
    {
        *t << "QUIT\r\n";
        // here, we just close.
        state = Close;
		//t->flush();
        emit status( tr( "Message sent" ) );
    }
    else if ( state == Close )
    {
        deleteLater();
        return;
    }
    else
    {
        // something broke.
        QMessageBox::warning( qApp->activeWindow(), tr( "Qt Mail Example" ), tr( "Unexpected reply from SMTP server:\n\n" ) + response );
        state = Close;
    }
    response = "";
}
 
#endif

#ifndef SMTP_H
#define SMTP_H

#include <QApplication>
#include <QMessageBox>
#include <QtDebug>
#include <QString>
#include <QObject>
#include <QTcpSocket>
#include <QTextStream>

class Smtp : public QObject
{
    Q_OBJECT

public:
    Smtp( const QString &from, const QString &to,  const QString
&subject, const QString &body );
    ~Smtp();

signals:
    void status( const QString & );

private slots:
    void readyRead();
    void connected();

	void stateChanged( QAbstractSocket::SocketState socketState );
	void errorReceived( QAbstractSocket::SocketError socketError );
	void disconnected();

private:
    enum State {
	Init,
	Mail,
	Rcpt,
	Data,
	Body,
	Quit,
	Close
    };

    QString message;
    QString from;
    QString rcpt;
    QTcpSocket * socket;
    QTextStream * t;
    int state;
    QString response;
};


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( error( QAbstractSocket::SocketError) ),
this, SLOT( errorReceived( QAbstractSocket::SocketError ) ) );   
    connect( socket, SIGNAL( stateChanged( QAbstractSocket::SocketState)
), this, SLOT( stateChanged( QAbstractSocket::SocketState ) ) );       
    connect( socket, SIGNAL( disconnectedFromHost()), this,
SLOT(disconnected() ) ); 
    message = QString::fromLatin1( "From: " ) +from
+QString::fromLatin1( "\nTo: " ) +to +QString::fromLatin1( "\nSubject: "
) +subject +QString::fromLatin1( "\n\n" ) +body +"\n";
    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;

	// change this to correct email server address
    socket->connectToHost( "xx.xx.xx.xxx", 25 );
   
	if( socket->waitForConnected( 30000 ) )
		qDebug()("connected");   

    t = new QTextStream( socket );   
}

Smtp::~Smtp()
{
    delete t;
    delete socket;
}
void Smtp::stateChanged( QAbstractSocket::SocketState socketState)
{
    qDebug() <<"stateChanged " << socketState;
}

void Smtp::errorReceived( QAbstractSocket::SocketError socketError)
{
    qDebug() << "error " <<socketError;
}

void Smtp::disconnected()
{
	qDebug() <<"disconneted";
	qDebug() << "error "  << socket->errorString();
}

void Smtp::connected()
{
    qDebug() << "Connected ";
}

void Smtp::readyRead()
{   
	if( !socket->canReadLine() )
		return;

	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' )
    {
        // HELLO 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";
		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";
		t->flush();
        state = Quit;
    }
    else if ( state == Quit && responseLine[0] == '2' )
    {
        *t << "QUIT\r\n";
        // here, we just close.
        state = Close;
		//t->flush();
        emit status( tr( "Message sent" ) );
    }
    else if ( state == Close )
    {
        deleteLater();
        return;
    }
    else
    {
        // something broke.
        QMessageBox::warning( qApp->activeWindow(), tr( "Qt Mail Example" ), tr( "Unexpected reply from SMTP server:\n\n" ) + response );
        state = Close;
    }
    response = "";
}

#endif

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This code is in Qt3 and I can't correct it to Qt4... How can I resolve the convertion from Qt3 to Qt4?

**wysota** · 9th December 2007, 11:51

This code is Qt4 code.

**systemz89** · 9th December 2007, 12:09

Originally Posted by wysota

This code is Qt4 code.

Ok.
I get the following error on compile:

Qt Code:

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smtp.h: In constructor &#8216;Smtp::Smtp(const QString&, const QString&, const QString&, const QString&)’:
smtp.h:79: error: no match for call to &#8216;(QDebug) (const char [10])’
make: *** [main.o] Error 1

smtp.h: In constructor ‘Smtp::Smtp(const QString&, const QString&, const QString&, const QString&)’:
smtp.h:79: error: no match for call to ‘(QDebug) (const char [10])’
make: *** [main.o] Error 1

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Here is the problem:

Qt Code:

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

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

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And won't work with

Qt Code:

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

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

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**wysota** · 9th December 2007, 17:39

include <QtDebug>

**sabeesh** · 14th December 2007, 03:54

Hi,
Please write details of your Qt version and OS. If it is Linix, Then you configure a mail server in your system and write the details to a file, What you need to send as a mail and use this command for send it as a mail
system("cat YourFileName.txt | mail -s \" Your Subject \" to_email_id@xxx.com");

After this you remove your test file.

**sadjoker** · 15th June 2008, 01:29

The Smtp class which systemz89 provided is working. Thanx

for saving me time.
Only changed to qDebug() << "connected"; made the class separated to .h and .cpp, and added main.cpp for execution. Then i tested it with local smtp server and it worked.
Now i should think how to make TLS AUTH to some smtp server too.

**patrik08** · 15th June 2008, 09:02

Originally Posted by sadjoker

The Smtp class which systemz89 provided is working. Thanx

for saving me time.
Only changed to qDebug() << "connected"; made the class separated to .h and .cpp, and added main.cpp for execution. Then i tested it with local smtp server and it worked.
Now i should think how to make TLS AUTH to some smtp server too.

Have a look on:
http://qt-webdav.svn.sourceforge.net..._auth_console/
i write this chunk and work on qmail server auth smtp + formated html text mail

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