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復制代碼代碼如下:

<b>普通的Email驗證</b> 
<form runat="server"> 
<table boder="#6699FF"> 
<tr><td colspan="2" align="center" ><asp:Label id="lblMsgShow" ForeColor="red" runat="server" /></td></tr> 
<tr><td>需要驗證的Email地址:</td><td><asp:TextBox id="tbEmail" runat="server" /></td></tr> 
<tr><td>郵件SMTP服務器：</td><td><asp:TextBox id="tbServer" runat="server" /></td></tr> 
<tr><td>SMTP端口：</td><td><asp:TextBox id="tbPort" Text="25" runat="server" /></td></tr> 
<tr><td colspan="2" ><asp:Button id="btnValidate" Text="驗證" OnClick="Validate_Email" runat="server" /></td></tr> 
</table> 
<b>驗證過程展示：</b> 
<asp:Panel id="ShowPro" runat="server" /> 
</form> 
Button控件的點擊將激發Valiate_Email事件，所有主程序操作全是在這個事件中完成，下面就來具體講解本事件處理中的代碼。 
關于TCP連接的東東，我就不想再重復了。。請大家自己去看我以前的文章: 
string strEmail,strServer; 
int intPort; 
strEmail = tbEmail.Text; 
strServer = tbServer.Text; 
intPort = Int32.Parse(tbPort.Text); file://默認端口是25 
TcpClient tcpc = new TcpClient(); 

復制代碼代碼如下:

try 
{ 
tcpc.Connect(strServer,intPort); 
StreamReader sr = new StreamReader(tcpc.GetStream(),Encoding.Default); 
sr.ReadLine(); 
... 
} 

復制代碼代碼如下:

file://寫入HELO命令 
if(OperaStream(tcpc,"HELOhttp://www.webjx.com") != "250") 
{ 
lblMsgShow.Text = "HELO 命令不能完成，本端口可能并非提供SMTP服務"; 
OperaStream(tcpc,"QUIT"); 
return; 
} 
file://寫入Mail From命令 
if(OperaStream(tcpc,"MAIL FROM: web@webjx.com") != "250") 
{ 
lblMsgShow.Text = "MAIL命令不能完成，SMTP服務需要驗證"; 
OperaStream(tcpc,"QUIT"); 
return; 
} 
file://寫入RCPT命令，這是關鍵的一步，后面的參數便是查詢的Email的地址 
if(OperaStream(tcpc,"RCPT TO: "+strEmail) != "250") 
{ 
lblMsgShow.Text = strEmail + "此郵件地址并非有效"; 
OperaStream(tcpc,"QUIT"); 
return; 
} 
else 
{ 
lblMsgShow.Text = strEmail + "是一個合法有效的郵件地址"; 
OperaStream(tcpc,"QUIT"); 
return; 
} 

復制代碼代碼如下:

public string OperaStream(TcpClient tcpc,string strCmd) 
{ 
Stream TcpStream; 
strCmd = strCmd + "\r\n"; file://加入換行符 
TcpStream = tcpc.GetStream(); 
byte[] bWrite = Encoding.Default.GetBytes(strCmd.ToCharArray()); 
TcpStream.Write(bWrite,0,bWrite.Length); 
StreamReader sr = new StreamReader(tcpc.GetStream(),Encoding.Default); 
string rl = sr.ReadLine(); 
string sp = rl.Substring(0,3); 
ShowPro.Controls.Add(new LiteralControl("執行命令：<font color=red>"+strCmd+"</font><br/>返回數據："+rl+"<br/>")); 
return sp; 
}