The following c++ example codes demonstrate how to send email over direct SSL connection on 465 port.
SSL connection encrypts data between the SMTP component and SMTP server to protects user, password and email content in TCP/IP level. Now this technology is commonly used and many SMTP servers are deployed with SSL such as Gmail, Yahoo and Hotmail. There are two ways to deploy SSL on SMTP server:
Explicit SSL (TLS)
Using STARTTLS command to switch SSL channel on normal SMTP port (25 or 587);
Implicit SSL
Deploying SSL on another port (465 or other port, you may query it from your server administrator
TLS is the successor of SSL, more and more SMTP servers require TLS 1.2
encryption now.
If your operating system is Windows XP/Vista/Windows 7/Windows 2003/2008/2008 R2/2012/2012 R2
, you need to
enable TLS 1.2 protocol in your operating system like this:
Enable TLS 1.2 on Windows XP/Vista/7/10/Windows 2008/2008 R2/2012
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\Include\tlh
or C:\Program Files (x86)\EASendMail\Include\tlh
folder,
find easendmailobj.tlh
and easendmailobj.tli
, and then copy these
files to your project folder.
The following example codes demonstrate how to send email over SSL connection on 465 port.
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.
#include "stdafx.h"
#include <tchar.h>
#include <Windows.h>
#include "EASendMailObj.tlh"
using namespace EASendMailObjLib;
const int ConnectNormal = 0;
const int ConnectSSLAuto = 1;
const int ConnectSTARTTLS = 2;
const int ConnectDirectSSL = 3;
const int ConnectTryTLS = 4;
int _tmain(int argc, _TCHAR* argv[])
{
::CoInitialize(NULL);
IMailPtr oSmtp = NULL;
oSmtp.CreateInstance(__uuidof(EASendMailObjLib::Mail));
oSmtp->LicenseCode = _T("TryIt");
// Set your sender email address
oSmtp->FromAddr = _T("test@emailarchitect.net");
// Add recipient email address
oSmtp->AddRecipientEx(_T("support@emailarchitect.net"), 0);
// Set email subject
oSmtp->Subject = _T("simple email from Visual C++ project");
// Set email body
oSmtp->BodyText = _T("this is a test email sent from Visual C++ project, do not reply");
// Your SMTP server address
oSmtp->ServerAddr = _T("smtp.emailarchitect.net");
// User and password for ESMTP authentication, if your server doesn't
// require User authentication, please remove the following codes.
oSmtp->UserName = _T("test@emailarchitect.net");
oSmtp->Password = _T("testpassword");
// Set 465 SMTP port
oSmtp->ServerPort = 465;
// Enable SSL/TLS connection
oSmtp->ConnectType = ConnectSSLAuto;
_tprintf(_T("Start to send email ...\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());
}
return 0;
}
Seperate builds of run-time dll for 32 and x64 platform
File | Platform |
Installation Path\Lib\native\x86\EASendMailObj.dll | 32 bit |
Installation Path\Lib\native\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
Comments
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