[Dovecot] Using IMAP keywords instead of mailboxes for spam with dovecot-antispam

[Johannes Berg]

> I haven't looked at your code, but struct mail always has a transaction
> (mail->transaction). You could fail the transaction by hooking into
> transaction_commit and calling rollback if your internal failure-flag
> was set.

> But that sounds a bit extreme.

Indeed. But I suppose if I always have a transaction I'll already be
hooked into it, I'll check that out.

>  Aren't you just adding/removing a single
> keyword? If so, you can use mail_update_keywords() to just add/remove
> that without reading/touching other keywords.

Evolution for example always replaces the complete keyword list, so that
doesn't really work easily.

johannes
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