Thanks to all for the suggestions. They were very good so I ignored
them. :)
I've patched imapd.c (cmd_login and cmd_authenticate) so that the
presence and contents of {config_dir}/captive/{username} indicate the
actual user that should be logged in (providing it begins with
disabled). So for example if /var/lib/imap/captive/smith contains
"disabled-archiving", then when smith logs in, it will really be
taken as disabled-archiving is logging in. disabled-archiving has
previously been primed with a message and has an ACL of lr to prevent
updates.
I've tried swapping things back and forth with Apple Mail and
Mulberry and things seem to work OK. I don't know how this will work
with a murder.
If anybody wants the patch (pretty small) I can send it somewhere
appropriate.
Thanks.
-nik
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