I use thunderbird very heavily many years, updating the app, keeping the profile dir for years. The problem is, on any account, even new, I uncheck all checkboxes, especially "Check on startup" and "Check periodically".
But anyway I receive notifications about new mail on these accounts. If I check "Automatically download new messages", they are also automatically downloaded, without "Check periodically" checkboxes. How to disable it? Why it is checking all accounts? I looked into all settings and never found the reason. Only FireTray is used from addons. Please help
The problem was on all versions I used. Before 45 series, now 52.0