Autoexpunge and special user namespace

[Timo Sirainen]

> On 09 Dec 2015, at 23:51, Joseph Tam <jtam.home at gmail.com> wrote:
> 
> On Wed, 9 Dec 2015, Timo Siraine wrote:
> 
>>> I'm interested in replacing my cron script that expunges old
>>> deleted mail with the new feature announced in 2.2.20
>>>> + Added mailbox { autoexpunge=<time> } setting. See
>>>> http://wiki2.dovecot.org/MailboxSettings for details.
>>> To use it, I need to specify which mailbox needs them using
>>> the namespace configuration.  For example
>>> 
>>> 	namespace inbox {
>>> 		mailbox Trash {
>>> 			auto = no
>>> 			special_use = \Trash
>>> 			autoexpunge = 7d
>>> 			mailbox_list_index = yes
>>> 		}
>>> ...
>> mailbox_list_index=yes is a global setting. You can't have it here.
> 
> Oh, yes.  Thanks for pointing that out.  By the way, what does it do?  The
> wiki states
> 
> 	mailbox_list_index=yes can help a lot by replying to IMAP STATUS
> 	(and similar) lookups from a single index without having to open
> 	each mailbox index separately.
> 
> So it create an uber-index that combines information from individual indices?

Some of the information, yes.

> Are there any drawback to using this?

It's more disk I/O for keeping the new index up to date.