stringimap_fetchheader(int imap_stream, int msgno, int flags);This function causes a fetch of the complete, unfiltered RFC 822 format header of the specified message as a text string and returns that text string.
The options are: FT_UID The msgno argument is a UID FT_INTERNAL The return string is in "internal" format, without any attempt to canonicalize to CRLF newlines FT_PREFETCHTEXT The RFC822.TEXT should be pre-fetched at the same time. This avoids an extra RTT on an IMAP connection if a full message text is desired (e.g. in a "save to local file" operation)