It turns out that the extracted HTML does contain an <img> tag -- it's just that I'd missed it because I was searching for ".png" in the source, and in fact the tag looks like this: <img src="cid:BARCODE" alt="" [...irrelevant bits elided...]>
FWIW, cid URLs are very old and were originally documented in 1997 (see RFC 2111 and RFC 2392). But probably you wouldn't encounter them unless you were a MUA author. --Ken -- Nmh-workers https://lists.nongnu.org/mailman/listinfo/nmh-workers
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