Not that I know of. And judging by experience with size of email-archives when migrating or saving such archives intentionally, I would not mind for the size of these files. Considering the size of modern HD, my past migration archives/backup archives, were microscopic, sub-nuclear.
But I do not tell this with guaranteed certainty. As I said, I hear your claim for the first time ever. I used the available options in Thunderbird to set things up as secure and conservative as possible, to my best knowledge. And you can have different options for every email box/adress you use with it.
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If you feel nuts, consult an expert.
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