ZoomText doesn't read more than the first sentence of a paragraph.
The ZoomText reader software doesn't read more than the first sentence of any paragraph inside of an email. It works fine with all other email software, just not Thunderbird. We understand this may be (and likely is) an issue with ZoomText, and have created a ticket with them ... but thought we would bring it up here too
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You're right to have contacted them first.
If they get back to you it would be nice to share the information here again.
For reference there is also an open bug report with recent comments indicating the same problems you're having: