Add note about non working Sieve filters in system mailbox #581
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I spent hours in my mailbox today trying to get Sieve filters to run according to the manual. No use, even debugging did not deliver any results. The filters can be checked in the webmailer GUI, linted via CLI, everything is fine - but nothing is executed. Until I accidentally came across the last sentence in the manual section about mailboxes, that filters do not run in the "system mailbox" at all. Well, I was working with a system mailbox.
So I added this information to the manual page about filters as well.