dynamic virtual mailboxes?

[MRob]

On 2019-05-03 16:03, Daniel Miller via dovecot wrote:
> On 5/2/2019 12:47 PM, MRob via dovecot wrote:
>> hi, I spent time learning about virtual mailboxes. Is there some way 
>> to create dynamic virtual mailboxes? I mean, when I look at a mailbox, 
>> I want to see only unread messages or flagged messages in that 
>> mailbox.
> 
> contents of /var/mail/mydomain/myuser/virtual/Flagged/dovecot-virtual:
> *
>    flagged
> 
> 
> contents of /var/mail/mydomain/myuser/virtual/Unread/dovecot-virtual:
> *
>    unseen
> 
> 
> contents of 
> /var/mail/mydomain/myuser/virtual/Unread-Flagged/dovecot-virtual:
> *
>    unseen flagged

That is not dynamically generated and it isn't limited to just one 
mailbox (dovecot terminology here is confusing, normally a mailbox is a 
mail account (user), but in this context "mailbox" I guess mean "folder" 
which is how I am using it, as it is used in 15-mailboxes.conf)