A Friend points out, and I have verified, that there is considerable
existing practice with MUA IMAP junk flags if you choose to look.
Thunderbird adds a flag called Junk to a message if it's flagged as
junk, and a flag called NonJunk to a message that has the junk
indicator subsequently turned off. Different IMAP servers store the
flag differently, but it's generally pretty easy to find -- Courier
puts it in a per-folder file, Dovecot adds lowercase code letters to
the message's filename, with a file called dovecot-keywords to tell
you what the letters mean.
Apparently other MUAs such as Apple Mail, pre-Thunderbird Eudora,
and Outlook also set similar IMAP flags. Anyone used them? The
friend says he's using Dovecot and uses the flags to train
spamassassin.
R's,
John
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