dovecot - Oct 2016 - Break up massive INBOX?

I have inherited a 10+ GB mailbox which dsync converted to maildir very 
nicely. But 15GB in tens of thousands of messages is too much in one 
INBOX when used in webmail.

I guess it's best to divide the messages into subfolders for date.

Is there a server-side way to safely move messages into new subfolders 
so that Dovecot indexes and UIDs won't break? If I write a shell script 
to move maildir files based on date of the files, I think Dovecot would 
not like this?

Also, is there any way to automatically create delivery or archive 
folders by date eg., on the 1st of each month? And deliver mails to the 
subfolder for the current month? I know I can create Sieve rules for 
such by hand, but prefer if there is a plugin or something to do this 
automatically.

On 25.10.2016 09:43, mrobti at insiberia.net wrote:
> I have inherited a 10+ GB mailbox which dsync converted to maildir
> very nicely. But 15GB in tens of thousands of messages is too much in
> one INBOX when used in webmail.
>
> I guess it's best to divide the messages into subfolders for date.
>
> Is there a server-side way to safely move messages into new subfolders
> so that Dovecot indexes and UIDs won't break? If I write a shell
> script to move maildir files based on date of the files, I think
> Dovecot would not like this?
>
> Also, is there any way to automatically create delivery or archive
> folders by date eg., on the 1st of each month? And deliver mails to
> the subfolder for the current month? I know I can create Sieve rules
> for such by hand, but prefer if there is a plugin or something to do
> this automatically.
Hi!

doveadm move is probably your friend here, see man doveadm-search-query
for details on what you can search for.

Aki

On 2016-10-25 06:51, Aki Tuomi wrote:
> On 25.10.2016 09:43, mrobti at insiberia.net wrote:
>> I have inherited a 10+ GB mailbox which dsync converted to maildir
>> very nicely. But 15GB in tens of thousands of messages is too much in
>> one INBOX when used in webmail.
>> 
>> I guess it's best to divide the messages into subfolders for date.
>> 
>> Is there a server-side way to safely move messages into new subfolders
>> so that Dovecot indexes and UIDs won't break? If I write a shell
>> script to move maildir files based on date of the files, I think
>> Dovecot would not like this?
>> 
>> Also, is there any way to automatically create delivery or archive
>> folders by date eg., on the 1st of each month? And deliver mails to
>> the subfolder for the current month? I know I can create Sieve rules
>> for such by hand, but prefer if there is a plugin or something to do
>> this automatically.
> 
> Hi!
> 
> doveadm move is probably your friend here, see man doveadm-search-query
> for details on what you can search for.
Thank you! I think I can script a few years of this:

doveadm mailbox create -u biguser -s 'May 2012'
doveadm move -u biguser 'May 2012' mailbox INBOX BEFORE 2012-06-01 SINCE
2012-05-01

Is there any plugin that can break up mailbox delivery automatically? I 
guess I can run the commands above on first of each month if that's the 
best way.