Determines the number of specific message parts in the collection.
CountParts is procedure that determines the number of specific message parts in the collection, and updates the TextPartCount, AttachmentCount, and RelatedPartCount properties to indicate the calculated values.
CountParts is used during generation of headers for a mail message prior to transmission in TIdMessage.GenerateHeader. You can force an update to these values prior to transmission (or on receipt) by calling CountParts.
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