The following c++ example codes demonstrate how to send email using Gmail SMTP server.
Gmail SMTP Server
Gmail SMTP server address is smtp.gmail.com
. It requires implicit SSL or explicit
SSL (TLS) connection, and you should use your Gmail email address as the user name
for ESMTP authentication.
Server | Port | SSL/TLS |
smtp.gmail.com | 25, 587 | TLS |
smtp.gmail.com | 465 | SSL |
Sections:
EASendMail is a SMTP component which supports all operations of SMTP/ESMTP protocols (RFC 821, RFC 822, RFC 2554). Before you can use the following example codes, you should download the EASendMail Installer and install it on your machine at first.
To use EASendMail SMTP ActiveX Object in your C++ project, the first step is “Add
header files of EASendMail to your project”. Please go to C:\Program Files\EASendMail\Samples_VC\simple.vcNative
or C:\Program Files (x86)\EASendMail\Samples_VC\simple.vcNative
folder,
find easendmailobj.tlh
and easendmailobj.tli
, and then copy these
files to your project folder.
The following example codes demonstrate sending email using Gmail SMTP server.
In order to run it correctly, please change SMTP server
, user
, password
, sender
, recipient
value to yours.
Note
To get full sample projects, please download and install EASendMail on your machine.
Important
If you got authentication error, you need to enable Allowing less secure apps or Sign in using App Passwords.
Another way is Gmail OAUH, please see Gmail SMTP OAUTH section.
#include "stdafx.h"
#include "easendmailobj.tlh"
using namespace EASendMailObjLib;
int _tmain(int argc, _TCHAR* argv[])
{
::CoInitialize( NULL );
IMailPtr oSmtp = NULL;
oSmtp.CreateInstance( "EASendMailObj.Mail");
oSmtp->LicenseCode = _T("TryIt");
// Set your gmail email address
oSmtp->FromAddr = _T("gmailid@gmail.com");
// Add recipient email address
oSmtp->AddRecipientEx( _T("support@emailarchitect.net"), 0 );
// Set email subject
oSmtp->Subject = _T("simple email from Visual C++ with gmail account");
// Set email body
oSmtp->BodyText = _T("this is a test email sent from Visual C++ project with Gmail");
// Gmail SMTP server address
oSmtp->ServerAddr = _T("smtp.gmail.com");
// If you want to use direct SSL 465 port,
// Please add this line, otherwise TLS will be used.
// oSmtp->ServerPort = 465;
// Set 25 or 587 SMTP port
oSmtp->ServerPort = 587;
// detect SSL/TLS automatically
oSmtp->SSL_init();
// Gmail user authentication should use your
// Gmail email address as the user name.
// For example: your email is "gmailid@gmail.com", then the user should be "gmailid@gmail.com"
oSmtp->UserName = _T("gmailid@gmail.com");
oSmtp->Password = _T("yourpassword");
_tprintf(_T("Start to send email via gmail account ...\r\n" ));
if( oSmtp->SendMail() == 0 )
{
_tprintf( _T("email was sent successfully!\r\n"));
}
else
{
_tprintf( _T("failed to send email with the following error: %s\r\n"),
(const TCHAR*)oSmtp->GetLastErrDescription());
}
if( oSmtp != NULL )
oSmtp.Release();
return 0;
}
The Gmail IMAP and SMTP servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Gmail Web OAuth instead of inputting user and password directly in application. This way is more secure, but a little bit complex.
Seperate builds of run-time dll for 32 and x64 platform
File | Platform |
Installation Path\EASendMailObj.dll | 32 bit |
Installation Path\x64\EASendMailObj.dll | 64 bit |
Standard EXE
For VB6, C++, Delphi or other standard exe application, you can distribute EASendMailObj.dll with your application to target machine without COM-registration and installer. To learn more detail, please have a look at Registration-free COM with Manifest File.
Script
For ASP, VBScript, VBA, MS SQL Stored Procedure, you need to install EASendMail on target machine by EASendMail installer, both 32bit/x64 DLL are installed and registered.
Appendix
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