Maximum length of message using Indy components

Question

I'm trying send message from delphi-code use TIdMessage. The message consists of 2 parts: text/plain and text/html. I have html-page as a template and some large text that need to insert to the template (in special place that was marked as ##text##). After merge the template and the text I get body of my new message. Then I send this message (use TIdMessage and TIdSMTP), but in a result the message contain only second part of the text. The text have more 40,000 characters. When I send message without html-tmplate (only large text) the everything is Ok.

How can I set length of message?

I tried to set FIdMessage.ContentTransferEncoding := 'quoted-printable' and FIdSMTP.MsgLineLength := MAXWORD; but it did not help me.

Thanks in advance.
Here are some code:

var
  FSMTP: TIdSMTP;
  FIdMessage: TIdMessage;
  idx: integer;
  i: Integer;
  FIdText: TIdText;
begin
  FSMTP := TIdSMTP.Create( nil );
  FIdMessage := TIdMessage.Create( nil );
  try
    try
      FIdMessage.ExtraHeaders.Clear;
      FIdMessage.MessageParts.Clear;

      // Attachments
      for idx := 0 to Attachments.Count - 1 do
        TIdAttachment.Create( FIdMessage.MessageParts,
          TEmailAttachment( Attachments.Items[ idx ] ).FLocalTemplateName );


      FIdMessage.From.Text := FFrom;
      FIdMessage.Recipients.EMailAddresses := FTo;
      FIdMessage.Subject := FSubject;
      if (FHtmlTemplateFilePath <> '') then
      begin
        FIdMessage.ContentType := 'multiparts/related; type="text/html"';
        AddAttachements(FIdMessage);  // procedure that added Attachments

        FIdText := TIdText.Create(FIdMessage.MessageParts, nil);
        FIdText.Body.Text := 'Please view a html version of this email';
        FIdText.ContentType := 'text/plain';


        FIdText := TIdText.Create(FIdMessage.MessageParts, nil);
        FIdText.Body.Text := FBody;
        FIdText.ContentType := 'text/html';

      end
      else
      begin
        FIdMessage.Body.Text := FBody;
      end;    

      FIdMessage.CCList.Clear;
      FIdMessage.ReceiptRecipient.Text := '';

      FSMTP.AuthenticationType := FSMTPAuthenticationType;
      FSMTP.UserID := FSMTPUserID;
      FSMTP.Password := FSMTPPassword;
      FSMTP.Host := FSMTPHost;
      FSMTP.Port := FSMTPPort;
      FSMTP.MsgLineLength := MAXWORD;

      RepeatRetryCount := FSMTPRepeatRetryCount;
      FSMTP.Connect;
       try
            FSMTP.Send( FIdMessage );
       finally
            FSMTP.Disconnect;
       end;
     except
       end;
  finally
    FSMTP.Free;
    FIdMessage.Free;
  end;
end;
procedure AddAttachements(AIdMessage: TidMessage);
var
  LCid: Integer;
  LFileName, LFileExt, LSearchFolder: String;
  LSearchResult: TSearchRec;
  Attachment: TIdAttachment;
begin
  FHtmlCids.Clear;
  LSearchFolder := ExtractFilePath(FHtmlTemplateFilePath)+ChangeFileExt(ExtractFileName(FHtmlTemplateFilePath),'');
  if (FindFirst(LSearchFolder + '_*', faDirectory, LSearchResult)=0) or
     (FindFirst(LSearchFolder + '.*', faDirectory, LSearchResult)=0)
  then
    LSearchFolder := LSearchResult.Name;

  FindClose(LSearchResult);
  if FindFirst(ExtractFilePath(FHtmlTemplateFilePath)+LSearchFolder+'\*.*', faAnyFile - faDirectory, LSearchResult)=0 then
  begin
    repeat
      Attachment := TIdAttachment.Create(AIdMessage.MessageParts, ExtractFilePath(FHtmlTemplateFilePath)+ LSearchFolder + '\' + LSearchResult.Name);
      LCid := Random(MaxInt);
      Attachment.ExtraHeaders.Values['Content-ID'] := IntToStr(LCid);
      LFileName := ExtractFileName(LSearchResult.Name);
      LFileExt := ExtractFileExt(LSearchResult.Name);
      if UpperCase(LFileExt) = '.XML' then
        Attachment.ContentType := 'text/xml'
      else if UpperCase(LFileExt) = '.PNG' then
        Attachment.ContentType := 'image/png'
      else if UpperCase(LFileExt) = '.THMX' then
        Attachment.ContentType := 'application/vnd.ms-officetheme'
      else if UpperCase(LFileExt) = '.JPG' then
        Attachment.ContentType := 'image/jpeg'
      else if UpperCase(LFileExt) = '.GIF' then
        Attachment.ContentType := 'image/gif'
      else if UpperCase(LFileExt) = '.SVG' then
        Attachment.ContentType := 'image/svg+xml'
      else if UpperCase(LFileExt) = '.TIF' then
        Attachment.ContentType := 'image/tiff'
      else if UpperCase(LFileExt) = '.TIFF' then
        Attachment.ContentType := 'image/tiff'
      else if UpperCase(LFileExt) = '.ICO' then
        Attachment.ContentType := 'image/vnd.microsoft.icon'
      else if UpperCase(LFileExt) = '.BMP' then
        Attachment.ContentType := 'image/bmp'
      else if UpperCase(LFileExt) = '.CSS' then
        Attachment.ContentType := 'text/css'
      else if UpperCase(LFileExt) = '.JS' then
        Attachment.ContentType := 'application/javascript'
      else if UpperCase(LFileExt) = '.JPEG' then
        Attachment.ContentType := 'image/jpeg'
      else if UpperCase(LFileExt) = '.WMZ' then
        Attachment.ContentType := 'application/x-ms-wmz'
      else raise Exception.CreateFmt('Unknown file type "%s"', [LFileExt]);
      FHtmlCids.AddObject(LSearchFolder+'/'+LFileName, TObject(LCid));
      FHtmlCids.AddObject(UrlEncode(LSearchFolder+'/'+LFileName), TObject(LCid));
    until FindNext(LSearchResult)<>0;
    FindClose(LSearchResult);
  end;
  FHtmlCids.Sort;
end;

score 2 · Answer 1 · answered Apr 28 '15 at 20:31

2

TIdMessage does not impose a limit on the text length. Something else is going on. My guess would be that you are simply not filling in the TIdMessage correctly. You did not show your AddAttachments() code, however you are adding TIdAttachment objects before the TIdText objects, and that is wrong, especially for the ContentType you are using. I suggest you read the following blog article on Indy's website for the proper structure of an HTML email in TIdMessage:

HTML Messages

However, do take notice of the following warning:

Unfortunately, Indy 9 does not handle the plaintext+html+images scenerio as well as it should. Indy 10 handles it better...

You are clearly not using Indy 10 (as evident by the fact that you are passing a filename to the TIdAttachment constructor - that constructor was moved to a new TIdAtttachmentFile class in Indy 10).

Also, just FYI, you do not need to set the MsgLineLength property, as it has no effect whatsoever (in fact, I did not know Indy even still had that property - it is a dead property used by TIdMessageClient.WriteFoldedLine(), which is itself a dead method that is not used by anything).

answered Apr 28 '15 at 20:31

Remy Lebeau

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Thank you very much for your answer and your advice. Yes it's Indy 9. I've just added code of AddAttachments(). – Roman Marusyk Apr 28 '15 at 20:53
I will add TIdAttachment objects after the TIdText objects tomorrow and I will write the result here. Thank you again – Roman Marusyk Apr 28 '15 at 20:57
I set TIdAttachment objects after the TIdText objects but the problem left – Roman Marusyk Apr 29 '15 at 07:27
I save body `FIdMessage.SaveToFile` before send. The output file contain proper data. So, as I understand the problem with FSMTP? – Roman Marusyk Apr 29 '15 at 10:42
No, because `TIdSMTP.Send()` and `TIdMessage.SaveTo...()` use the same generator internally, so the data output is the same (not counting dynamic values, like the `Date` header, and MIME boundaries). – Remy Lebeau Apr 29 '15 at 17:22
Thank you! But I don't understand why was the problem with text that is in one line? Is there any limit on length of line in html? – Roman Marusyk Apr 29 '15 at 19:17

Roman Marusyk · Accepted Answer · 2015-04-29T13:02:35.937

Thanks to everybody, I seems found solution. The problem was with CR LF. Before call my procedure (see above) for send message I inserted large text instead ##text## in html-template. First, I replaced all CR LF on <br> in my text and then I replaced ##text## on my text in template. (my text - some large text)

As a result I had got body of message before send like:

<html>
....
<body>
some large text <br> in one line. This text have more 40,000 characrets.....
</body>
</html>

Massage:

ine. This text have more 40,000 characrets

When I left CR LF and add tag <br>, then I got this body:

<html>
....
  <body>
    some large text <br> 
    in one line. This text have more 40,000 characrets.....
  </body>
</html>

And message:

some large text
in one line. This text have more 40,000 characrets.....

So, in this case if all text is in one line -> massage isn't full, if text in html in a few line -> everything ok

PS. Sorry for my English

It looks like it's failing if there's no line break (CRLF) every 2048 characters. — bLight, Jun 30 '19 at 16:18

Maximum length of message using Indy components

2 Answers2