Problem in Sending smtp mail with c++

Question

i try with this code but it not send any mail to destination mail address. any one can help me to correct it ???!!!

#pragma comment(lib, "wsock32.lib")
#define _CRT_SECURE_NO_WARNINGS
#include <windows.h>
#include <iostream>
using namespace std;
bool EmailSMTP(char* hname, char* sndr, char* rece, char *sbj, char *usr, char *passwd, int port)
{
int iResult;
WSADATA wsaData;
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed: %d\n", iResult);
return 0;
}
int iProtocolPort = port;
char tekst[4096] = "";
SOCKET hServer;
LPHOSTENT lpHostEntry;
LPSERVENT lpServEntry;
SOCKADDR_IN SockAddr;

lpHostEntry = gethostbyname(hname);
if (!lpHostEntry)
{
cout << "Nie znaleziono hosta" << " Błąd" ;
return 0;
}

hServer = socket(PF_INET, SOCK_STREAM, 0);
if (hServer == INVALID_SOCKET)
{
cout << "Nie udało się utworzyć serwera." << " Błąd";
return 0;
}
lpServEntry = getservbyname("mail", 0);
if (!lpServEntry)
iProtocolPort = htons(IPPORT_SMTP);
else
iProtocolPort = lpServEntry->s_port;

SockAddr.sin_family = AF_INET;
SockAddr.sin_port = iProtocolPort;
SockAddr.sin_addr = *((LPIN_ADDR)*lpHostEntry->h_addr_list);


connect(hServer, (PSOCKADDR)&SockAddr, sizeof(SockAddr));
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "HELO\r\n");
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "AUTH LOGIN\r\n");
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "%s\r\n", usr);
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "%s\r\n", passwd);
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "MAIL FROM:<%s>\r\n", sndr);
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "RCPT TO:<%s>\r\n", rece);
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "DATA\r\n");
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "From: tester <%s>\r\n", sndr);
send(hServer, tekst, strlen(tekst), 0);

sprintf(tekst, "To: tester <%s>\r\n", rece);
send(hServer, tekst, strlen(tekst), 0);

sprintf(tekst, "Subject: %s\r\n", sbj);
send(hServer, tekst, strlen(tekst), 0);

sprintf(tekst, "\r\n.\r\n");
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

sprintf(tekst, "QUIT\r\n");
send(hServer, tekst, strlen(tekst), 0);
recv(hServer, tekst, sizeof(tekst), 0);

closesocket(hServer);
return 1;
}

int main()
{
EmailSMTP("mail.domain.com", "[e-mail]", "[e-mail]", "hello", "info", "password", 25);
return 0;
}

Thanks.

Answer 1

Hi,

According to your code, you are trying to send email to gmail account. As far as I know, gmail SMTP server will not accept any mail without authentication. You may need to do authentication with SSL or TLS enabled.

About SSL/TLS you may refer to the link below.

SMTP Client with SSL/TLS

By the way, don't forget to call WSACleanup when done using the Winsock dll.

May

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Answer 2

Hi

thanks for your attention.

but no, i want use mail servers with authentication for example smtp mail server, port, username and password such as gmail, hotmail and another services. Thanks for your links, i now follow it for resolving my problem with it.

Thanks. :-)

Answer 3

Hi，

How about your issue now? Is it fixed? If it is fixed, could you please share your solution with us? If not, please feel free to let us know.

》Thanks for your links, i now follow it for resolving my problem with it.

Do the links work for you?

May

---

We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click HERE to participate the survey.