Thunderbird won't download some emails

Because of some frustrations with Mac Mail, I switched to Thunderbird which I've used in the past.

Unfortunately, it only downloads some of the emails. If I check on the server, there are still emails waiting to be downloaded. If I open Mail, it will download all the email. But Thunderbird won't do it.

In an attempt to solve the problem, I have tued off all junk mail controls in both the server and local folder settings for Thunderbird. But I still can't get them.

What can I do?

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