Number of mail messages does not match the number in mail activity

This is not a big deal but I have noticed that when mail arrives the Mail Activity window tells me how many incoming messages are being downloaded. This number often bears no relationship to the number that arrive. For example it might read 4 messages are downloading when in reality only 1 arrives. If I look at my webmail all messages are listed. Does anyone know what causes these inconsistencies?

I do not have any answer, but I have the same problem. AND the RSS feeds do not make up the difference; and yesterday I disabled junk mail filtering. And I've made certain that I have no unread mail left over. Yet Mail Activity reported downloading 16 messages, but I only received 8. This happens daily, but the proportion of unaccounted emails varies.

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