/// <summary>
/// 发送邮件
/// </summary>
/// <param name="smtpHost">SMTP服务器</param>
/// <param name="port">SMTP服务器端口</param>
/// <param name="from">邮件发送者</param>
/// <param name="displayFromName">显示的发送者名称</param>
/// <param name="authentication">是否进行认证</param>
/// <param name="userName">认证用户名</param>
/// <param name="password">认证密码</param>
/// <param name="To">邮件接收者</param>
/// <param name="displayToName">显示的接收者名称</param>
/// <param name="priority">优先级</param>
/// <param name="html">是否为HTML</param>
/// <param name="Base">URL</param>
/// <param name="subject">邮件主题</param>
/// <param name="message">邮件内容</param>
/// <param name="errmsg">错误信息 </param>
public int SendMail(string smtpHost, int port, string @from, string displayFromName, bool authentication,
string userName, string password, string To, string displayToName, Priority priority,
bool html, string Base, string subject, string message, out string errmsg)
{
try
{
@from = "<" + @from + ">";
To = "<" + To + ">";
////if (To.IndexOf(";") > -1)
//// To = "<" + To.Replace(";", ">,<") + ">";
////else
//// To = "<" + To + ">";
var Name = new[]
{
"服务器地址", "端口", "发信邮箱", "发送者名称", "是否认证(Smtp登录)", "认证用户名", "认证密码", "邮件接受者", "接受者姓名",
"优先级"
, "是否HTML", "相对连接地址(在有图片或连接时)", "主题", "正文"
};
var NameParameter = new[]
{
smtpHost, port.ToString(), @from, displayFromName, authentication.ToString(),
userName, password, To, displayToName, priority.ToString(), html.ToString(),
Base, subject, message
};
//以上为发送邮件失败时记录到网站根目录的文本文件中
string strResponseNumber; //smtp服务器返回的信息
var smtpcMail = new SMTPClient(); //实例化连接类
smtpcMail.Connect(smtpHost, port); //连接SmtpHost服务器,端口Port
bool boolConnect = smtpcMail.isConnected(); //返回连接是否成功
//判断是否进行了连接
if (!boolConnect)
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, string.Join(",", NameParameter), "未能取得连接", "");
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>未能取得连接");
errmsg = "smtpcMail.Connect error:未能取得连接";
return -1;
}
strResponseNumber = smtpcMail.GetServerResponse(); //得到服务器返回的信息
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "220"))) //包含220表示成功连接
{
smtpcMail.Close();
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>请求连接失败");
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "请求连接失败",
// FormatString(strResponseNumber).Trim());
errmsg = "smtpcMail.GetServerResponse error:" + FormatString(strResponseNumber).Trim();
return -1;
}
smtpcMail.SendCommandToServer("HELO kaidongmei\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "与服务器连接初期（打招呼出错）",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>与服务器连接初期（打招呼出错）");
errmsg = FormatString(strResponseNumber).Trim();
return 1;
}
//第一步结束
if (authentication) //是否认证
{
//与服务器通讯第二步：请求登录
smtpcMail.SendCommandToServer("AUTH LOGIN\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "334")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "请求登录出现错误",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>请求登录出现错误");
errmsg = FormatString(strResponseNumber).Trim();
return 2;
}
//与服务器通讯第三步：输入用户帐号
smtpcMail.SendCommandToServer(Encode(userName) + "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "334")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入用户名称出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入用户名称出错");
errmsg = FormatString(strResponseNumber).Trim();
return 3;
}
//第三步结束
//与服务器通讯第四步：输入用户密码
smtpcMail.SendCommandToServer(Encode(password) + "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "235")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入用户密码出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入用户密码出错");
errmsg = FormatString(strResponseNumber).Trim();
return 4;
}
//第四步结束
}
//与服务器通讯第五步：输入发送邮件的信箱地址
smtpcMail.SendCommandToServer("MAIL FROM: " + @from + /* + " AUTH = " + From*/ "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入发信邮箱出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入发信邮箱出错");
errmsg = FormatString(strResponseNumber).Trim();
return 5;
}
//第五步结束
//与服务器通讯第六步：输入接收邮件的信箱地址
smtpcMail.SendCommandToServer("RCPT TO: " + To + "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入接收邮箱出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入接收邮箱出错");
errmsg = FormatString(strResponseNumber).Trim();
return 6;
}
//第六步结束
//与服务器通讯第七步：输入邮箱主题内容
smtpcMail.SendCommandToServer("DATA\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "354")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "打开输入邮件主内容出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>打开输入邮件主内容出错");
errmsg = "smtpcMail.SendCommandToServer error:" + FormatString(strResponseNumber).Trim();
return 7;
}
/*邮件主要内容开始 相关参考
FROM:<姓名><邮件地址> 格式：FROM:管理员
TO: <姓名><邮件地址> 格式：TO:Name<*****@*****.**>
SUBJECT:<标题> 格式：SUBJECT:今天的天气很不错！
DATE:<时间> 格式：DATE: Thu, 29 Aug 2002 09:52:47 +0800 (CST)
REPLY-TO:<收邮件地址> 格式：REPLY-TO:[email protected]
Content-Type:<邮件类型> 格式：Content-Type: multipart/mixed; boundary=unique-boundary-1
X-Priority:<邮件优先级> 格式：X-Priority:3
MIME-Version：<版本> 格式：MIME-Version:1.0
Content-Transfer-Encoding:<内容传输编码> 格式：Content-Transfer-Encoding:Base64
X-Mailer:<邮件发送者> 格式：X-Mailer:FoxMail 4.0 beta 1 [cn] */
string strData = "";
strData = string.Concat("From: ", displayFromName + @from);
strData = string.Concat(strData, "\r\n");
strData = string.Concat(strData, "To: ");
strData = string.Concat(strData, displayToName + To);
strData = string.Concat(strData, "\r\n");
strData = string.Concat(strData, "Subject: ");
strData = string.Concat(strData, subject);
strData = string.Concat(strData, "\r\n");
if (html)
{
strData = string.Concat(strData, "Content-Type: text/html;charset=\"gb2312\"");
}
else
{
strData = string.Concat(strData, "Content-Type: text/plain;charset=\"gb2312\"");
}
strData = string.Concat(strData, "\r\n");
//strData = string.Concat(strData,"Content-Transfer-Encoding: base64;");
//strData = string.Concat(strData,"\r\n");
strData = string.Concat(strData, "X-Priority: " + priority);
strData = string.Concat(strData, "\r\n");
strData = string.Concat(strData, "MIME-Version: 1.0");
strData = string.Concat(strData, "\r\n");
//strData = string.Concat(strData,"Content-Type: text/html;" );
//strData = string.Concat(strData,"\r\n");
strData = string.Concat(strData, "X-Mailer: Email自动发送程序 1.0 ");
strData = string.Concat(strData, "\r\n" + "\r\n");
strData = string.Concat(strData, message);
//执行.命令结束传输
strData = string.Concat(strData, "\r\n.\r\n");
smtpcMail.SendCommandToServer(strData);
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "添加-结束添加邮件内容出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>添加-结束添加邮件内容出错");
errmsg = "smtpcMail.SendCommandToServer(strData) error:" + FormatString(strResponseNumber).Trim();
return 7;
}
//第七步完成
//最后执行.QUIT命令断开连接
smtpcMail.SendCommandToServer("QUIT\r\n");
Thread.Sleep(50);
smtpcMail.Close();
}
catch (SocketException err)
{
strErrMessage += err.Message + " " + err.StackTrace;
errmsg = "SocketException err:" + strErrMessage;
return -1;
}
catch (Exception e)
{
strErrMessage += e.Message + " " + e.StackTrace;
errmsg = "Exception e:" + strErrMessage;
return -1;
}
errmsg = "邮件发送成功";
return 0;
}
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="smtpHost">SMTP服务器</param>
/// <param name="port">SMTP服务器端口</param>
/// <param name="from">邮件发送者</param>
/// <param name="displayFromName">显示的发送者名称</param>
/// <param name="authentication">是否进行认证</param>
/// <param name="userName">认证用户名</param>
/// <param name="password">认证密码</param>
/// <param name="To">邮件接收者</param>
/// <param name="displayToName">显示的接收者名称</param>
/// <param name="priority">优先级</param>
/// <param name="html">是否为HTML</param>
/// <param name="Base">URL</param>
/// <param name="subject">邮件主题</param>
/// <param name="message">邮件内容</param>
/// <param name="errmsg">错误信息 </param>
public int SendMail(string smtpHost, int port, string @from, string displayFromName, bool authentication,
string userName, string password, string To, string displayToName, Priority priority,
bool html, string Base, string subject, string message, out string errmsg)
{
try
{
@from = "<" + @from + ">";
To = "<" + To + ">";
////if (To.IndexOf(";") > -1)
//// To = "<" + To.Replace(";", ">,<") + ">";
////else
//// To = "<" + To + ">";
var Name = new[]
{
"服务器地址", "端口", "发信邮箱", "发送者名称", "是否认证(Smtp登录)", "认证用户名", "认证密码", "邮件接受者", "接受者姓名",
"优先级"
, "是否HTML", "相对连接地址(在有图片或连接时)", "主题", "正文"
};
var NameParameter = new[]
{
smtpHost, port.ToString(), @from, displayFromName, authentication.ToString(),
userName, password, To, displayToName, priority.ToString(), html.ToString(),
Base, subject, message
};
//以上为发送邮件失败时记录到网站根目录的文本文件中
string strResponseNumber; //smtp服务器返回的信息
var smtpcMail = new SMTPClient(); //实例化连接类
smtpcMail.Connect(smtpHost, port); //连接SmtpHost服务器,端口Port
bool boolConnect = smtpcMail.isConnected(); //返回连接是否成功
//判断是否进行了连接
if (!boolConnect)
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, string.Join(",", NameParameter), "未能取得连接", "");
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>未能取得连接");
errmsg = "smtpcMail.Connect error:未能取得连接";
return(-1);
}
strResponseNumber = smtpcMail.GetServerResponse(); //得到服务器返回的信息
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "220"))) //包含220表示成功连接
{
smtpcMail.Close();
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>请求连接失败");
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "请求连接失败",
// FormatString(strResponseNumber).Trim());
errmsg = "smtpcMail.GetServerResponse error:" + FormatString(strResponseNumber).Trim();
return(-1);
}
smtpcMail.SendCommandToServer("HELO kaidongmei\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "与服务器连接初期（打招呼出错）",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>与服务器连接初期（打招呼出错）");
errmsg = FormatString(strResponseNumber).Trim();
return(1);
}
//第一步结束
if (authentication) //是否认证
{
//与服务器通讯第二步：请求登录
smtpcMail.SendCommandToServer("AUTH LOGIN\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "334")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "请求登录出现错误",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>请求登录出现错误");
errmsg = FormatString(strResponseNumber).Trim();
return(2);
}
//与服务器通讯第三步：输入用户帐号
smtpcMail.SendCommandToServer(Encode(userName) + "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "334")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入用户名称出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入用户名称出错");
errmsg = FormatString(strResponseNumber).Trim();
return(3);
}
//第三步结束
//与服务器通讯第四步：输入用户密码
smtpcMail.SendCommandToServer(Encode(password) + "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "235")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入用户密码出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入用户密码出错");
errmsg = FormatString(strResponseNumber).Trim();
return(4);
}
//第四步结束
}
//与服务器通讯第五步：输入发送邮件的信箱地址
smtpcMail.SendCommandToServer("MAIL FROM: " + @from + /* + " AUTH = " + From*/ "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入发信邮箱出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入发信邮箱出错");
errmsg = FormatString(strResponseNumber).Trim();
return(5);
}
//第五步结束
//与服务器通讯第六步：输入接收邮件的信箱地址
smtpcMail.SendCommandToServer("RCPT TO: " + To + "\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "输入接收邮箱出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>输入接收邮箱出错");
errmsg = FormatString(strResponseNumber).Trim();
return(6);
}
//第六步结束
//与服务器通讯第七步：输入邮箱主题内容
smtpcMail.SendCommandToServer("DATA\r\n");
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "354")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "打开输入邮件主内容出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>打开输入邮件主内容出错");
errmsg = "smtpcMail.SendCommandToServer error:" + FormatString(strResponseNumber).Trim();
return(7);
}
/*邮件主要内容开始 相关参考
*
* FROM:<姓名><邮件地址> 格式：FROM:管理员
*
* TO: <姓名><邮件地址> 格式：TO:Name<*****@*****.**>
*
* SUBJECT:<标题> 格式：SUBJECT:今天的天气很不错！
*
* DATE:<时间> 格式：DATE: Thu, 29 Aug 2002 09:52:47 +0800 (CST)
*
* REPLY-TO:<收邮件地址> 格式：REPLY-TO:[email protected]
*
* Content-Type:<邮件类型> 格式：Content-Type: multipart/mixed; boundary=unique-boundary-1
*
* X-Priority:<邮件优先级> 格式：X-Priority:3
*
* MIME-Version：<版本> 格式：MIME-Version:1.0
*
* Content-Transfer-Encoding:<内容传输编码> 格式：Content-Transfer-Encoding:Base64
*
* X-Mailer:<邮件发送者> 格式：X-Mailer:FoxMail 4.0 beta 1 [cn] */
string strData = "";
strData = string.Concat("From: ", displayFromName + @from);
strData = string.Concat(strData, "\r\n");
strData = string.Concat(strData, "To: ");
strData = string.Concat(strData, displayToName + To);
strData = string.Concat(strData, "\r\n");
strData = string.Concat(strData, "Subject: ");
strData = string.Concat(strData, subject);
strData = string.Concat(strData, "\r\n");
if (html)
{
strData = string.Concat(strData, "Content-Type: text/html;charset=\"gb2312\"");
}
else
{
strData = string.Concat(strData, "Content-Type: text/plain;charset=\"gb2312\"");
}
strData = string.Concat(strData, "\r\n");
//strData = string.Concat(strData,"Content-Transfer-Encoding: base64;");
//strData = string.Concat(strData,"\r\n");
strData = string.Concat(strData, "X-Priority: " + priority);
strData = string.Concat(strData, "\r\n");
strData = string.Concat(strData, "MIME-Version: 1.0");
strData = string.Concat(strData, "\r\n");
//strData = string.Concat(strData,"Content-Type: text/html;" );
//strData = string.Concat(strData,"\r\n");
strData = string.Concat(strData, "X-Mailer: Email自动发送程序 1.0 ");
strData = string.Concat(strData, "\r\n" + "\r\n");
strData = string.Concat(strData, message);
//执行.命令结束传输
strData = string.Concat(strData, "\r\n.\r\n");
smtpcMail.SendCommandToServer(strData);
Thread.Sleep(50);
strResponseNumber = smtpcMail.GetServerResponse();
if (!(smtpcMail.DoesStringContainSMTPCode(strResponseNumber, "250")))
{
smtpcMail.Close();
//TextLog.ErrorLog(_Server, "ErrorText.txt", Name, NameParameter, "添加-结束添加邮件内容出错",
// FormatString(strResponseNumber).Trim());
Dev.Log.Loger.Error(string.Join(",", NameParameter) + "=>添加-结束添加邮件内容出错");
errmsg = "smtpcMail.SendCommandToServer(strData) error:" + FormatString(strResponseNumber).Trim();
return(7);
}
//第七步完成
//最后执行.QUIT命令断开连接
smtpcMail.SendCommandToServer("QUIT\r\n");
Thread.Sleep(50);
smtpcMail.Close();
}
catch (SocketException err)
{
strErrMessage += err.Message + " " + err.StackTrace;
errmsg = "SocketException err:" + strErrMessage;
return(-1);
}
catch (Exception e)
{
strErrMessage += e.Message + " " + e.StackTrace;
errmsg = "Exception e:" + strErrMessage;
return(-1);
}
errmsg = "邮件发送成功";
return(0);
}
/// <summary>
/// 返回错误描述
/// </summary>
/// <param name="str">服务器返回的信息</param>
/// <returns>错误描述</returns>
private string FormatString(string str)
{
var smtpcMail = new SMTPClient();
string s = str.Substring(0, 3);
str = str.Substring(0, str.IndexOf("\0"));
switch (s)
{
case "500":
return "邮箱地址错误" + "，服务器原始反馈信息：" + str;
case "501":
return "参数格式错误" + "，服务器原始反馈信息：" + str;
case "502":
return "命令不可实现" + "，服务器原始反馈信息：" + str;
case "503":
return "服务器需要SMTP验证" + "，服务器原始反馈信息：" + str;
case "504":
return "命令参数不可实现" + "，服务器原始反馈信息：" + str;
case "421":
return "服务未就绪，关闭传输信道" + "，服务器原始反馈信息：" + str;
case "450":
return "要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）" + "，服务器原始反馈信息：" + str;
case "550":
return "要求的邮件操作未完成，邮箱不可用（例如，邮箱未找到，或不可访问）" + "，服务器原始反馈信息：" + str;
case "451":
return "放弃要求的操作；处理过程中出错" + "，服务器原始反馈信息：" + str;
case "551":
return "用户非本地，请尝试<forward-path>" + "，服务器原始反馈信息：" + str;
case "452":
return "系统存储不足，要求的操作未执行" + "，服务器原始反馈信息：" + str;
case "552":
return "过量的存储分配，要求的操作未执行" + "，服务器原始反馈信息：" + str;
case "553":
return "邮箱名不可用，要求的操作未执行（例如邮箱格式错误）" + "，服务器原始反馈信息：" + str;
case "432":
return "需要一个密码转换" + "，服务器原始反馈信息：" + str;
case "534":
return "认证机制过于简单" + "，服务器原始反馈信息：" + str;
case "538":
return "当前请求的认证机制需要加密" + "，服务器原始反馈信息：" + str;
case "454":
return "临时认证失败" + "，服务器原始反馈信息：" + str;
case "530":
return "需要认证" + "，服务器原始反馈信息：" + str;
default:
return "没有匹配的错误处理，服务器返回参数：" + str;
}
}
/// <summary>
/// 返回错误描述
/// </summary>
/// <param name="str">服务器返回的信息</param>
/// <returns>错误描述</returns>
private string FormatString(string str)
{
var smtpcMail = new SMTPClient();
string s = str.Substring(0, 3);
str = str.Substring(0, str.IndexOf("\0"));
switch (s)
{
case "500":
return("邮箱地址错误" + "，服务器原始反馈信息：" + str);
case "501":
return("参数格式错误" + "，服务器原始反馈信息：" + str);
case "502":
return("命令不可实现" + "，服务器原始反馈信息：" + str);
case "503":
return("服务器需要SMTP验证" + "，服务器原始反馈信息：" + str);
case "504":
return("命令参数不可实现" + "，服务器原始反馈信息：" + str);
case "421":
return("服务未就绪，关闭传输信道" + "，服务器原始反馈信息：" + str);
case "450":
return("要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）" + "，服务器原始反馈信息：" + str);
case "550":
return("要求的邮件操作未完成，邮箱不可用（例如，邮箱未找到，或不可访问）" + "，服务器原始反馈信息：" + str);
case "451":
return("放弃要求的操作；处理过程中出错" + "，服务器原始反馈信息：" + str);
case "551":
return("用户非本地，请尝试<forward-path>" + "，服务器原始反馈信息：" + str);
case "452":
return("系统存储不足，要求的操作未执行" + "，服务器原始反馈信息：" + str);
case "552":
return("过量的存储分配，要求的操作未执行" + "，服务器原始反馈信息：" + str);
case "553":
return("邮箱名不可用，要求的操作未执行（例如邮箱格式错误）" + "，服务器原始反馈信息：" + str);
case "432":
return("需要一个密码转换" + "，服务器原始反馈信息：" + str);
case "534":
return("认证机制过于简单" + "，服务器原始反馈信息：" + str);
case "538":
return("当前请求的认证机制需要加密" + "，服务器原始反馈信息：" + str);
case "454":
return("临时认证失败" + "，服务器原始反馈信息：" + str);
case "530":
return("需要认证" + "，服务器原始反馈信息：" + str);
default:
return("没有匹配的错误处理，服务器返回参数：" + str);
}
}