On 2021-05-06 at 12:36:31 UTC-0400 (Thu, 06 May 2021 17:36:31 +0100) Martin S Taylor <[email protected]> is rumored to have said:
Well it *is* on my mail server, obviously. But isn't 'Junk' and 'Not Junk' just two sides of the same flag?
Nope. Related but independent flags, generally. See https://www.iana.org/assignments/imap-jmap-keywords/notjunk/notjunk-template and https://www.iana.org/assignments/imap-jmap-keywords/junk/junk-template
How can both be ticked at the same time?
There can be multiple entities (server-side filters, client-side filters, & user) that can in principle set the IMAP $Junk and/or $NotJunk flags and anything that sets one of them SHOULD make sure the other is unset. Also of note: no one SHOULD send spam and no spam filter SHOULD ever misjudge the spamminess of a message...
In other words: you probably have 2 different things capable of marking messages as Junk or NotJunk, and they disagreed. Whichever tool acted last arguably is a broken implementation because it should either treat the prior determination (by something/someone else) as dispositive and not set a conflicting flag OR consider itself authoritative (i.e. if you tell MM or another client to mark a message "Not Junk") and clear the conflicting flag OR consider the conflict to be a sign of uncertainty and clear both. The registered definitions of the flags (see above) states that mail with "$Junk AND $NotJunk" set should be treated as having neither flag set. Conceptually,
Note that some IMAP-like mail systems (e.g. GMail) partially conflate flags and mailboxes, confusing the issue further.
-- Bill Cole [email protected] or [email protected] (AKA @grumpybozo and many *@billmail.scconsult.com addresses) Not Currently Available For Hire _______________________________________________ mailmate mailing list [email protected] https://lists.freron.com/listinfo/mailmate
