Are these attachments being "sent" individually or "forwarded" to others?
There is a difference in how Thunderbird sees these and if you Google the topic you will find lots of threads on this subject, one of which I'm sure will match your own circumstances.
It's possible that someone else here might have a better specific knowledge of how to overcome this other than by researching the threads I've mentioned yourself.
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Knows nothing and cares even less
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