On 1/31/25 11:01, Arte Chambers via Mailman-users wrote:
Thanks, this was helpful. It was a message I sent to the list that was just
an image attachment with no body text. I noticed this other thread
about messages
with attachments, without text discarded silently
<https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/EVL5SUQGAILHWZWBKHD5VLN4OZV4ITIV/>.
I am attaching the pickle file hoping that it helps anyone researching this
issue.

I think the underlying issue is the same as in that thread. While your message has mime structure

multipart/mixed
    multipart/alternative
        text/plain     <- empty
        text/html
    image/jpeg

If you have content filtering Collapse alternatives = yes, it will become

multipart/mixed
    text/plain     <- empty
    image/jpeg

after collapsing alternatives and that will trigger the error. See https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message/FIORYUBGUSVHHIN6CCXT6DY5F53DKKZN/ for a patch (not yet tested) that I think will fix this.

--
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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