delphi用smtp发邮件时，如何通过 ssl 认证 ( 积分: 100 )

delphi用 smtp发邮件时，如何通过 ssl 认证。 比如现在的 126 的信息必须要通过ssl才能收发邮件。

抄段代码给你，测试过，能发的，自己研究研究
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, Psock, NMsmtp;

type
TForm1 = class(TForm)
Label1: TLabel;
txtTo: TEdit;
Label2: TLabel;
txtFrom: TEdit;
Label3: TLabel;
txtSubject: TEdit;
Label4: TLabel;
memContents: TMemo;
Label5: TLabel;
txtUserName: TEdit;
Label6: TLabel;
txtPassword: TEdit;
chkSmtpVerify: TCheckBox;
btnSend: TButton;
btnOpen: TButton;
txtSwfFile: TEdit;
Label7: TLabel;
OpenDialog1: TOpenDialog;
Label8: TLabel;
txtSmtpServer: TEdit;
NMSMTP1: TNMSMTP;
Label9: TLabel;
txtPort: TEdit;
procedure btnOpenClick(Sender: TObject);
procedure btnSendClick(Sender: TObject);
procedure NMSMTP1SendStart(Sender: TObject);
procedure NMSMTP1Connect(Sender: TObject);
procedure chkSmtpVerifyClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
function EncodeString(Decoded:string):String;
function EncodeBASE64(Encoded: TMemoryStream {TMailText}; Decoded: TMemoryStream): Integer; //编码函数

implementation

{$R *.dfm}

{对参数TMemoryStrema中的字节流进行Base64编码，编码后的结果
保存在Encoded中，函数返回编码长度}
function EncodeBASE64(Encoded: TMemoryStream ; Decoded: TMemoryStream): Integer;
const
_Code64: String[64] =
('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/');
var
I: LongInt;
B: array[0..2279] of Byte;
J, K, L, M, Quads: Integer;
Stream: string[76];
EncLine: String;
begin

Encoded.Clear;

Stream := '';
Quads := 0;

{为提高效率，每2280字节流为一组进行编码}
J := Decoded.Size div 2280;

Decoded.Position := 0;

{对前J*2280个字节流进行编码}
for I := 1 to J do
begin
Decoded.Read(B, 2280);

for M := 0 to 39 do
begin
for K := 0 to 18 do
begin
L:= 57*M + 3*K;

Stream[Quads+1] := _Code64[(B[L] div 4)+1];
Stream[Quads+2] := _Code64[(B[L] mod 4)*16 + (B[L+1] div 16)+1];
Stream[Quads+3] := _Code64[(B[L+1] mod 16)*4 + (B[L+2] div 64)+1];
Stream[Quads+4] := _Code64[B[L+2] mod 64+1];

Inc(Quads, 4);

if Quads = 76 then
begin
Stream[0] := #76;
EncLine := Stream+#13#10;
Encoded.Write(EncLine[1], Length(EncLine));
Quads := 0;
end;
end;
end;
end;

{对以2280为模的余数字节流进行编码}
J := (Decoded.Size mod 2280) div 3;

for I := 1 to J do
begin
Decoded.Read(B, 3);

Stream[Quads+1] := _Code64[(B[0] div 4)+1];
Stream[Quads+2] := _Code64[(B[0] mod 4)*16 + (B[1] div 16)+1];
Stream[Quads+3] := _Code64[(B[1] mod 16)*4 + (B[2] div 64)+1];
Stream[Quads+4] := _Code64[B[2] mod 64+1];

Inc(Quads, 4);

{每行76个字符}
if Quads = 76 then
begin
Stream[0] := #76;
EncLine := Stream+#13#10;
Encoded.Write(EncLine[1], Length(EncLine));
Quads := 0;
end;
end;
{“=”补位}
if (Decoded.Size mod 3) = 2 then
begin
Decoded.Read(B, 2);

Stream[Quads+1] := _Code64[(B[0] div 4)+1];
Stream[Quads+2] := _Code64[(B[0] mod 4)*16 + (B[1] div 16)+1];
Stream[Quads+3] := _Code64[(B[1] mod 16)*4 + 1];
Stream[Quads+4] := '=';

Inc(Quads, 4);
end;

if (Decoded.Size mod 3) = 1 then
begin
Decoded.Read(B, 1);

Stream[Quads+1] := _Code64[(B[0] div 4)+1];
Stream[Quads+2] := _Code64[(B[0] mod 4)*16 + 1];
Stream[Quads+3] := '=';
Stream[Quads+4] := '=';
Inc(Quads, 4);
end;

Stream[0] := Chr(Quads);

if Quads > 0 then
begin
EncLine := Stream+#13#10;
Encoded.Write(EncLine[1], Length(EncLine));
end;

Result := Encoded.Size;
end;

{对参数Decoded字符串进行Base64编码，返回编码后的字符串}
function EncodeString(Decoded:string):String;
var
mmTemp,mmDecoded:TMemoryStream;
strTemp:TStrings;
begin
mmTemp := TMemoryStream.Create;
mmDecoded:=TMemoryStream.Create;
strTemp:=TStringList.Create;

strTemp.Add(Decoded);
strTemp.SaveToStream(mmTemp);
mmTemp.Position := 0;

{剔除mmTemp从strTemp中带来的字符#13#10}
mmDecoded.CopyFrom(mmTemp,mmTemp.Size-2);

{对mmDecoded进行Base64编码，由mmTemp返回编码后的结果}
EncodeBASE64(mmTemp,mmDecoded);

{获得Base64编码后的字符串}
mmTemp.Position:=0;
strTemp.LoadFromStream(mmTemp);

{返回结果必须从strTemp[0]中获得，如果使用strTemp.Text会
带来不必要的字符#13#10}
Result:=strTemp[0];
end;

procedure TForm1.btnOpenClick(Sender: TObject);
begin
{打开对话框，选择SWF文件}
if OpenDialog1.Execute then
begin
txtSwfFile.Text:=OpenDialog1.FileName;
end;
end;

procedure TForm1.btnSendClick(Sender: TObject);
var
mmSwfFile,mmEncoded:TMemoryStream;
iResult:Integer;
strsTemp:TStrings;
strContents:TStringList;
i:Integer;
begin
{验证用户输入信息}
if txtTo.Text='' then
begin
ShowMessage('请输入收信人！');
Exit;
end;
if txtFrom.Text='' then
begin
ShowMessage('请输入发信人！');
Exit;
end;
if txtSmtpServer.Text='' then
begin
ShowMessage('请输入SMTP服务器！');
Exit;
end;
if txtPort.Text='' then
begin
ShowMessage('请输入端口号！');
Exit;
end;
if txtSwfFile.Text='' then
begin
ShowMessage('请选择SWF文件!');
Exit;
end;

{检验服务器认证的用户名和密码}
if chkSmtpVerify.Checked = True then
if (txtUserName.Text='') or (txtPassword.Text='') then
begin
ShowMessage('您已选择SMTP服务器需要认证'+#13#10+'请输入用户名和密码！');
Exit;
end;

{设置SMTP服务器地址、端口}
NMSMTP1.Host:=txtSmtpServer.Text;
NMSMTP1.Port:=StrToInt(txtPort.Text);

{断开原来的连接，保证TForm1.NMSMTP1Connect中服务器认证的执行}
if NMSMTP1.Connected then
begin
NMSMTP1.Disconnect;
end;

{连接服务器}
NMSMTP1.Connect;

{创建流}
mmSwfFile:=TMemoryStream.Create;
mmEncoded:=TMemoryStream.Create;

{加载文件至流mmSwfFile}
mmSwfFile.LoadFromFile(txtSwfFile.Text);

{对mmSwfFile进行Base64编码，mmEncoded为编码后内容}
iResult:=EncodeBASE64(mmEncoded,mmSwfFile);

strsTemp:=TStringList.Create;
mmEncoded.Position:=0;
strsTemp.LoadFromStream(mmEncoded);

{----生成邮件内容----}
strContents:=TStringList.Create;
strContents.Add('--------------SwfEmail by JDH');
strContents.Add('Content-Type: text/html; charset=gb2312');
strContents.Add('Content-Transfer-Encoding: 8bit');
{注意：空行是邮件格式所必需的！}
strContents.Add('');
strContents.Add('<HTML><HEAD><TITLE>SWFEMAIL</TITLE></HEAD>');
strContents.Add('<BODY>');

{添加邮件正文内容}
for i:=0 to memContents.Lines.Count-1 do
begin
strContents.Add(memContents.Lines + '<br>');
end;

{添加SWF文件相关内容}
strContents.Add('<object classid=&quot;clsid27CDB6E-AE6D-11cf-96B8-444553540000&quot; codebase=&quot;http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0&quot;>');
strContents.Add('<param name=movie value=&quot;cid:jdh_swfemail@001&quot;>');
strContents.Add('<param name=quality value=high>');
strContents.Add('<embed src=&quot;cid:jdh_swfemail@001&quot; quality=high pluginspage=&quot;http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash&quot; type=&quot;application/x-shockwave-flash&quot; >');
strContents.Add('</embed></object></BODY></HTML>');
strContents.Add('');
strContents.Add('--------------SwfEmail by JDH');
strContents.Add('Content-Type: image/swf');
strContents.Add('Content-ID: <jdh_swfemail@001>');
strContents.Add('Content-Transfer-Encoding: base64');
strContents.Add('Content-Disposition: inline; filename=&quot;'+ExtractFileName(txtSwfFile.Text)+'&quot;' );
strContents.Add('');
strContents.Add(strsTemp.Text);
strContents.Add('');
{----生成邮件内容结束----}

{设置邮件发送信息}
NMSMTP1.PostMessage.FromAddress := txtFrom.Text;
NMSMTP1.PostMessage.FromName := txtFrom.Text;
NMSMTP1.PostMessage.ToAddress.Text := txtTo.Text;
NMSMTP1.PostMessage.Body.Text := strContents.Text;
NMSMTP1.PostMessage.Subject := txtSubject.Text;

{发送电子邮件}
NMSMTP1.SendMail;

ShowMessage('邮件发送成功！');
end;



procedure TForm1.NMSMTP1Connect(Sender: TObject);
var
strUserName,strPassword:string;
begin
{如果SMTP服务器需要认证，则进行认证}
if chkSmtpVerify.Checked = True then
begin
{对用户名和密码进行Base64编码}
strUserName:=EncodeString(txtUserName.Text);
strPassword:=EncodeString(txtPassword.Text);

{进行认证，输入编码后的用户名、密码}
nmsmtp1.Transaction('auth login');
nmsmtp1.Transaction(strUserName);
nmsmtp1.Transaction(strPassword);
end;
end;

procedure TForm1.NMSMTP1SendStart(Sender: TObject);
begin
{在邮件发送开始时修改邮件的消息头，标明邮件为多部分组成}
NMSMTP1.FinalHeader.Values['Content-Type'] := 'multipart/related; boundary=&quot;------------SwfEmail by JDH&quot;';
end;

procedure TForm1.chkSmtpVerifyClick(Sender: TObject);
begin
{根据是否需要SMTP服务器认证，改变用户名、密码状态}
if chkSmtpVerify.Checked = True then
begin
txtUserName.Enabled := True;
txtUserName.Color:= clWindow;
txtPassword.Enabled := True;
txtPassword.Color:= clWindow;
end
else
begin
txtUserName.Enabled := False;
txtUserName.Color:= clSilver;
txtPassword.Enabled := False;
txtPassword.Color:= clSilver;
end;
end;

end.

谢谢你,不过在我的程序中的这段代码已经加入了. 最初的,没加这个代码的,只能进入很早以前申请的邮箱.加入了这段代码之际后.大部分的邮箱都可以收发了.但是还不能对新的126信箱的操作. 因为 126 信箱是要经过,ssl 认证的. 所以求助.如何通过 ssl 认证.

试试TIdSSLIOHandlerSocket组件，作为TIdSMTP组件的IOHandler属性。
对TIdSSLIOHandlerSocket组件的属性进行设置再试试.
--仅供参考。