email - Delphi/Indy 10 - 发送带有附件的文本或 HTML 电子邮件会为文本(正文)本身添加一个附件

Question

多年来，我们一直使用 Indy 10 发送附有一个或多个 PDF 的电子邮件(文本，而不是 HTML)，并且我们从未遇到过任何问题.

最近(也许从东京版本 3 开始？)，我们的客户注意到电子邮件(正文)的文本部分现在是附件，而不是电子邮件本身的一部分。

我在互联网上搜索了解决方案，但我测试的所有内容都没有解决这个问题。

我尝试了 Remy Lebeau 在 StackOverflow 上提出的一些解决方案，但没有成功。

这是代码(基于 StackOverflow 上的帖子)

procedure TForm1.btnSendEmailClick(Sender: TObject);

var
   smtp   : TIdSMTP;
   msg    : TidMessage;
   builder: TIdMessageBuilderHtml;

begin
   msg := TidMessage.Create(nil);

   try
      builder := TIdMessageBuilderHtml.Create();

      try
         // FIsBodyHtml IS FALSE
         if FIsBodyHtml then begin
            builder.Html.Text   := edText.Lines.Text;
            builder.HtmlCharSet := 'utf-8';
            builder.HtmlContentTransfer := 'quoted-printable';
         end else begin
            builder.PlainText.Text := edText.Lines.Text;;
            builder.PlainTextCharSet := 'utf-8';
            builder.PlainTextContentTransfer := 'quoted-printable';
         end;

         // Add attached file here
         if (edFile.Text <> '') and FileExists(edFile.Text) then begin
            builder.Attachments.Add(edFile.Text);
         end;

         builder.FillMessage(msg);
      finally
         builder.Free;
      end;

      msg.From.Name    := 'From name here';
      msg.From.Address := 'From email address here';
      msg.Subject      := edSubject.Text;

      msg.Recipients.EmailAddresses := edEMail.Text;
      // msg.CCList.EmailAddresses     := CCAddresses;
      // msg.BccList.EmailAddresses    := BCCAddresses;

      smtp := TIdSMTP.Create(nil);

      try
         smtp.Host     := 'Host IP here';
         // Smtp.UseTLS   := utNoTLSSupport;
         smtp.Port     := 25;
         // smtp.Username := '';
         // smtp.Password := '';
         // smtp.AuthType := satDefault;

         smtp.Connect();

         try
           smtp.Send(msg);
         finally
           smtp.Disconnect;
         end;

      finally
         smtp.Free();
      end;
   finally
     msg.Free();
   end;

   ShowMessage('EMail with attachment sent.');
end;

我们的服务提供商更改某些内容之前的原始数据:

X-Spam-Flag: NO
X-Envelope-From: stephans@xys.com
Return-Path: <stephans@xyz.com>
Received: from alt44.smtp-out.videotron.ca (alt44.smtp-out.videotron.ca [23.233.128.31])
    by mail124c7.megamailservers.com (8.14.9/8.13.1) with ESMTP id w8IE2EaJ031620
    for <stephans@xyz.com>; Tue, 18 Sep 2018 10:02:16 -0400
Received: from STEPHANS (99.99.99.99])
    by Videotron with SMTP
    id 2GZxgRaQACk662GZygKZJC; Tue, 18 Sep 2018 10:02:14 -0400
Message-ID: <0575a0d8ec54a7560be55a121df5deb7@smtp.videotron.ca>
X-Authority-Analysis: v=2.3 cv=I/dLuuog c=1 sm=1 tr=0
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 a=x4g3fk4yahj5Vy8AyNEA:9 a=n3BslyFRqc0A:10 a=QGevMSd5eboA:10
From: "Stephan St-Denis" <stephans@xyz.com>
Subject: Sending an email with an attachment
To: stephans@xyz.com
Content-Type: multipart/mixed; boundary="sYOn6pS43NerAC6V2swiiWL68DI9=_SoRR"
MIME-Version: 1.0
Date: Tue, 18 Sep 2018 10:02:11 -0400
X-CMAE-Envelope: MS4wfKOiVw8oDz+nXCTnbMSWSKyXaMU478wM3VDSWQBABhzflbVLGHq70qeoq1ROGHLKj2lDQPx1LLDrcmvbcOtrdhj4j8xx2kLFmh3LfsDxgKpXpd44Lyvy
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X-CTCH-Spam: Unknown
X-CTCH-VOD: Unknown
X-CTCH-RefID: str=0001.0A020201.5BA10569.0015,ss=1,re=0.000,recu=0.000,reip=0.000,vtr=str,vl=0,cl=1,cld=1,fgs=0
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X-WHL: LR
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This is the text that will be sent along with the attached file. This =
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The text should not be attached but should be part of the email.

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原始数据之后我们的服务提供商更改了某些内容

X-Spam-Flag: NO
X-Envelope-From: stephans@xyz.com
Return-Path: <stephans@xyz.com>
Received: from alt14.smtp-out.videotron.ca (alt14.smtp-out.videotron.ca [135.19.0.27])
    by mail141c7.megamailservers.com (8.14.9/8.13.1) with ESMTP id w8JCvhOr015926
    for <stephans@xyz.com>; Wed, 19 Sep 2018 08:57:45 -0400
Received: from STEPHANS ([99.99.99.99])
    by Videotron with SMTP
    id 2c34gzZ4bMdc62c35g1R7X; Wed, 19 Sep 2018 08:57:43 -0400
Message-ID: <5283e5cb2949102f2e22f509477dacaa@smtp.videotron.ca>
X-Authority-Analysis: v=2.3 cv=PoG9kTE3 c=1 sm=1 tr=0
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From: "Stephan St-Denis" <stephans@xyz.com>
Subject: Sending an email with an attachment
To: stephans@xyz.com
Content-Type: multipart/mixed; boundary="2oubkSu12F4FBVsrQ1qmkA=_rIo3IvFYNM"
MIME-Version: 1.0
Date: Wed, 19 Sep 2018 08:57:42 -0400
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X-CTCH-Spam: Unknown
X-CTCH-VOD: Unknown
X-CTCH-RefID: str=0001.0A02020C.5BA247CA.0005,ss=1,re=0.000,recu=0.000,reip=0.000,vtr=str,vl=0,cl=1,cld=1,fgs=0
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X-WHL: LR
X-EsetId: 37303A298E2AB560627264

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Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

This is the text that will be sent along with the attached file. This =
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The text should not be attached but should be part of the email.

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--2oubkSu12F4FBVsrQ1qmkA=_rIo3IvFYNM
Content-Type: application/pdf;
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Content-Transfer-Encoding: base64
Content-Disposition: attachment;
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Answer 1

我们的 Microsoft Mail 也遇到同样的问题。这是由文本部分中的“Content-Disposition: inline”行引起的，该行导致 MS Mail 将文本部分显示为可下载附件。删除 Content-Disposition 行可以解决此问题，但需要您修改 TIdMessageClient.SendBody。坦白说，我认为 MS Mail 是罪魁祸首。