Indicates the number of text message parts in the collection.
property TextPartCount: integer;
TextPartCount is a read-only Integer property that identifies the number of text parts in the message parts collection. TextPartCount is updated in CountParts, and indicates the number of TIdText items detected in the collection using the TIdMessagePart.ClassType method.
AttachmentCount, RelatedPartCount, and TextPartCount can be used when headers are generated for an outgoing mail message. You can force an update to these values prior to transmission (or on receipt) by calling CountParts.
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