SMTP Client for Qt (C++) - Version 2.0

The SmtpClient for Qt is small library written for Qt 5 / 6 (C++ version) that allows application to send complex emails (plain text, html, attachments, inline files, etc.) using the Simple Mail Transfer Protocol (SMTP).

New in version 2.0:

• Asynchronous & Synchronous working mode

• Qt5/6 compatibility

• Building as a shared library

• code of SmtpClient refactored and partially rewrited

New in version 1.1:

SMTP Client for Qt (C++) - Version 2.0

The SmtpClient for Qt is small library writen for Qt 4 (C++ version) that allows application to send complex emails (plain text, html, attachments, inline files, etc.) using the Simple Mail Transfer Protocol (SMTP). This library was originally written by Tőkés Attila! but since it didn't see activity and pull requests went unanswered for years, in 2020 we decided to Fork and maintain a new version.

New in version 2.0:

• Asynchronous & Synchronous working mode
• Qt5 compatibility
• Building as a shared library
• code of SmtpClient refactored and partially rewrited
• CMake build support

SMTP Client for Qt supports

• TCP, SSL and TLS connections to SMTP servers
• SMTP authentication (PLAIN and LOGIN methods)
• sending MIME emails (to multiple recipients)
• multiple types of recipients (to, cc, bcc)
• plain text and HTML (with inline files) content in emails
• multiple attachments and inline files (used in HTML)
• nested mime emails (mixed/alternative, mixed/related)
• different character sets (ascii, utf-8, etc) and encoding methods (7bit, 8bit, base64)
• error handling
• output compilant with RFC2045

Examples

Lets see a simple example:

#include <QtCore>
#include "../src/SmtpMime"

int main(int argc, char *argv[])
{
{
    QCoreApplication a(argc, argv);

    // This is a first demo application of the SmtpClient for Qt project

    // Now we create a MimeMessage object. This is the email.

    MimeMessage message;

    EmailAddress sender("your_email_address@host.com", "Your Name");
    message.setSender(sender);

    EmailAddress to("recipient@host.com", "Recipient's Name");
    message.addRecipient(to);

    message.setSubject("SmtpClient for Qt - Demo");

    // Now add some text to the email.
    // First we create a MimeText object.

    MimeText text;

    text.setText("Hi,\nThis is a simple email message.\n");

    // Now add it to the mail

    message.addPart(&text);

    // Now we can send the mail
    SmtpClient smtp("smtp.gmail.com", 465, SmtpClient::SslConnection);

    smtp.connectToHost();
    if (!smtp.waitForReadyConnected()) {
        qDebug() << "Failed to connect to host!";
        return -1;
    }

    smtp.login("your_email_address@host.com", "your_password");
    if (!smtp.waitForAuthenticated()) {
        qDebug() << "Failed to login!";
        return -2;
    }

    smtp.sendMail(message);
    if (!smtp.waitForMailSent()) {
        qDebug() << "Failed to send mail!";
        return -3;
    }

    smtp.quit();

}

For more examples see the Wiki/Examples.

License

This project (all files including the demos/examples) is licensed under the GNU LGPL, version 2.1.

Copyright (c) 2020 - Comm5 Tecnologia Copyright (c) 2014-2022 - Attila Tőkés