首先用VC做個pop3收郵件程序；不能連接；pop3的端口是110或995；

用telnet看一下能否收到郵箱郵件；這些都是不從瀏覽器進入郵箱收郵件的方式；telnet方式見此；

https://blog.csdn.net/bcbobo21cn/article/details/51321841

telnet也不能連接到郵箱；

一個VC通用的pop3類如下；

// pop3.cpp: implementation of the pop3 class. // //#include "stdafx.h" #include "pop.h" #include "pop3.h" #include "fstream.h"#ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif// // Construction/Destruction //pop3::pop3() {m_PopServer.Create(); }pop3::~pop3() {m_PopServer.Close(); }BOOL pop3::Connect(CString & Host, CString & User, CString & Password) {char buf [512];if (!m_PopServer.Connect(Host,110)) // 110 Pop3 Port//if (!m_PopServer.Connect(Host,995)) // qq{m_ErrorMessage = _T("Server cannot be connected");AfxMessageBox("Server cannot be connected!");return FALSE;}else{if(CheckResponse(CONNECTION_CHECK)==FALSE){AfxMessageBox("CAN NOT CONNECT TO SERVER!");return FALSE;}wsprintf (buf, "USER %s\r\n", (LPCSTR) User);m_PopServer.Send(buf, strlen (buf));if(CheckResponse(USER_CHECK)==FALSE){AfxMessageBox("WRONG USER!");return FALSE;}wsprintf (buf, "PASS %s\r\n", (LPCSTR) Password);m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(PASSWORD_CHECK)==FALSE){AfxMessageBox("WRONG PASSWORD!");return FALSE;}return TRUE;}}BOOL pop3::Delete(int & MsgNumber) {char buf [512];wsprintf (buf, "DELE %d\r\n",MsgNumber );m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(DELETE_CHECK)==FALSE)return FALSE;elsereturn TRUE; }BOOL pop3::Disconnect() {char buf [512];wsprintf (buf, "QUIT \r\n");m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(QUIT_CHECK)==FALSE)return FALSE;elsereturn TRUE; }BOOL pop3::Noop() {char buf [512];wsprintf (buf, "NOOP \r\n");m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(NOOP_CHECK)==FALSE)return FALSE;elsereturn TRUE; }int pop3::GetMessageSize(int MsgNumber) {if(m_SizeOfMsg.GetSize() < MsgNumber+1)return 0;elsereturn m_SizeOfMsg[MsgNumber+1];}BOOL pop3::Reset() {char buf [512];wsprintf (buf, "RSET \r\n");m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(RSET_CHECK)==FALSE)return FALSE;elsereturn TRUE; }// MsgContents will hold the msg body BOOL pop3::Retrieve(int MsgNumber) {char buf [512];ZeroMemory(buf, 512);wsprintf (buf, "RETR %d\r\n",MsgNumber );m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(RETR_CHECK)==FALSE)return FALSE;elsereturn TRUE; }BOOL pop3::Statistics() {char buf [512];wsprintf (buf, "STAT \r\n");m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(STAT_CHECK)==FALSE)return FALSE;else return TRUE; }CString pop3::GetMsgContents() {return m_MsgContents; }int pop3::GetNumberOfMails() {return m_NumberMail; }int pop3::GetTotalMailSize() {return m_TotalSize; }BOOL pop3::Connect() {Connect(m_Host, m_User, m_Password);return TRUE; }void pop3::SetHost(CString & Host) {m_Host = Host; }CString pop3::GetHost() {return m_Host; }void pop3::SetUser(CString & User) {m_User = User; }CString pop3::GetUser() {return m_User; }void pop3::SetPassword(CString & Password) {m_Password = Password; }CString pop3::GetPassword() {return m_Password; }BOOL pop3::CheckResponse(int ResponseType) {char buf [1000];for (int i=0;i<512;i++)buf[i]='\0';m_PopServer.Receive(buf, sizeof(buf));switch (ResponseType){case CONNECTION_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Bad Connection");return FALSE;} break;case USER_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Bad User Name");return FALSE;} break;case PASSWORD_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Bad Password Name");return FALSE;}break;case QUIT_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during QUIT");return FALSE;}break;case DELETE_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during DELE");return FALSE;}break;case RSET_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during RSET");return FALSE;}break;case STAT_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during STAT");return FALSE;}else{BOOL EmailNumber = TRUE;for (char *p = buf; *p != '\0'; p++){if (*p == '\t' || *p == ' '){ if(EmailNumber == TRUE){m_NumberMail = atoi(p);EmailNumber = FALSE;}else{m_TotalSize = atoi(p);return TRUE;}}}}break;case NOOP_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during NOOP");AfxMessageBox("NOOP ERR!");return FALSE;}break;case LIST_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during LIST");return FALSE;}else{m_PopServer.Receive(buf, sizeof(buf));for (char *p = buf; *p != '.'; p++)if (*p == '\t' || *p == ' ')m_SizeOfMsg.Add(atoi(p));}break; case RETR_CHECK:if (strnicmp(buf,"-ERR", 4) == 0){m_ErrorMessage = _T("Error occured during RETR");return FALSE;}else{char temp[9000];char buf1 [512];wsprintf (buf1, "NOOP \r\n");m_MsgContents = "";do{for(int k = 0; k <1000; k++)for(int l = 0; l <10000; l++){}//sleep(1111);int i = m_PopServer.Receive(temp, sizeof(temp));m_MsgContents += temp;int t = m_MsgContents.Find("\n.\r\n\0");if(t>0)m_MsgContents = m_MsgContents.Left(t);t = m_MsgContents.Find("+OK ");if(t>0){m_MsgContents = m_MsgContents.Left(t);break;}m_PopServer.Send(buf1, strlen (buf1));if(i <= 30 && strnicmp(temp,"+OK ",4) == 0)break;}while(1);}break;}return TRUE; }CString pop3::GetErrorMessage() {return m_ErrorMessage; }BOOL pop3::List() {char buf [512];wsprintf (buf, "LIST \r\n");m_PopServer.Send(buf, strlen (buf)); if (CheckResponse(LIST_CHECK)==FALSE)return FALSE;elsereturn TRUE;}

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頭文件；

// pop3.h: interface for the pop3 class. // //#if !defined(AFX_POP3_H__A7D9D85A_D946_48CE_AA1F_3C1A2D894BE7__INCLUDED_) #define AFX_POP3_H__A7D9D85A_D946_48CE_AA1F_3C1A2D894BE7__INCLUDED_#if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #define CONNECTION_CHECK 0 #define USER_CHECK 1 #define PASSWORD_CHECK 2 #define QUIT_CHECK 3 #define DELETE_CHECK 4 #define RSET_CHECK 5 #define STAT_CHECK 6 #define NOOP_CHECK 7 #define LIST_CHECK 8 #define RETR_CHECK 9class pop3 { public:pop3();virtual ~pop3();BOOL List();CWordArray m_SizeOfMsg;CString GetErrorMessage();CString GetPassword();void SetPassword(CString& Password);CString GetUser();void SetUser(CString& User);CString GetHost();void SetHost(CString& Host);BOOL Connect();int GetTotalMailSize();int GetNumberOfMails();CString GetMsgContents();BOOL Statistics();BOOL Retrieve(int MsgNumber);BOOL Reset();int GetMessageSize(int MsgNumber);BOOL Noop();BOOL Disconnect();BOOL Delete(int& MsgNumber);BOOL Connect(CString& Host, CString& User, CString& Password);private:CString m_ErrorMessage;BOOL CheckResponse(int ResponseType);CString m_Password;CString m_User;CString m_Host;CString m_MsgContents;int m_TotalSize; int m_NumberMail;CSocket m_PopServer;};#endif // !defined(AFX_POP3_H__A7D9D85A_D946_48CE_AA1F_3C1A2D894BE7__INCLUDED_)

連不上；想起來還沒用過foxmail；foxmail也是從桌面直接收郵件的；

foxmail也連不上；上網(wǎng)查了一下；原來自己郵箱的pop3和smtp功能默認是關(guān)閉的；

在郵箱設(shè)置里面開啟；需要手機驗證；為安全，如果不從桌面收郵件，不要開啟；

然后foxmail可以收郵件了 ；其設(shè)置如下；

再試程序；還是不能連接；

再用telnet，還是連不上；

修改代碼里面連接端口；試一下端口為110的郵箱；運行結(jié)果如下；

連不了；telnet此郵箱看一下；

客戶端禁止；郵箱的pop3和smtp功能默認關(guān)閉；又要手機驗證；先不搞了；

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