Thunderbird keeps deleting and re-downloading e-mails
About once a week, Thunderbird displays the message "23,000 e-mails deleted from inbox" and starts downloading all the e-mail headers again for the IMAP account. It takes a while to do that, during which Thunderbird's response becomes sluggish. How can I stop it from doing that? It seems to me that once email headers have been downloaded, they should stay downloaded, and there should be no need to download them again.
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I have two mail providers, AOL on two legacy verizson.com accounts, and Gmail. One of the AOL accounts is my main email address which has accumulated 23,000 messages over the past 20 yeas. That is the one that Thunderbird has been repeatedy re-downloading all the message headers for.
About a week ago, I upgraded to the current version of Thunderbird, and the problem is much less. I noticed it re-downloading only once, it downloaded fewer headers, and it was much faster doing it. So, the problem might have resolved itself.