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delphiindyindy10

TIdMessageParts.CountParts Returns 0

I'm trying to pull multipart emails in MIME format from an IMAP server using Indy 10.5.5 in Delphi 2010. These are the lines of code that I'm having trouble with are below, where I instatiate the curMessage object, retrieve a message into it, and then call CountParts:

var
  curMessage: TIdMessage;   
  IMAP4: TIdIMAP4;
  msgIndex: Integer;

begin
  ...
  curMessage := TIdMessage.Create(nil);
  IMAP4.Retrieve(msgIndex, curMessage);
  curMessage.MessageParts.CountParts;
  //code that checks counts
  //and 
end;

I then have some code that checks the various count properties of curMessage.MessageParts (i.e. TextPartCount). However, the CountPart procedure isn't returning anything, because the Count property referenced in the procedure block is 0, even though I've verified that the message is retrieved and placed into the curMessage.

One thing I've noticed, and haven't gotten to the bottom of yet, is that IsMsgSinglePartMime is coming back as true, even though all the messages on the server have Content-Type: multipart/mixed;.

Any help would be really appreciated.

What am I missing here? I can provide more code if needed,

Solution

  • Without seeing the actual email data, it is difficult to say for sure exactly why the data is not where you expect it to be. But if the TIdMessage.IsMsgSinglePartMime is getting set to True then that means that either:

    1. TIdMessage.Encoding is meMIME but TIdMessage.MIMEBoundary.Count is 0, meaning there was no MIME boundary value detected in the top-level Content-Type header. If the Content-Type is a 'multipart/...' type, a boundary is required. If it is present, it is likely malformed in a way that prevented Indy from parsing it.

    2. TIdMessage.Encoding is mePlainText but TIdMessage.ContentTransferEncoding is either 'base64' or 'quoted-printable'.

    In either case, if there is body content present then it would end up in the TIdMessage.Body property if it is textual data, otherwise it would end up in the TIdMessage.MessageParts as an attachment instead. Since TIdMessage.MessageParts.Count is 0 in your case, the data is either in TIdMessage.Body, or is got discarded.

    You may want to consider upgrading to a newer Indy version. The version shipped with D2010 is pretty old, and there have been fixes/changes made to TIdIMAP4 and TIdMessage (and its internal parsers) in recent years.