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To set when thunderbird checks for messages or not! open TB. click on your account name,then in the window that opens, under accounts, click on view settings for this account, Then server settings, you should find what you are looking for! If I understand your post correctly
I had not understood. And, it should be under Account settings, because it is an account by account preference (I have 11 separate mail accounts, and I have a variety of settings for each).