> > > breaking the mail index
> >
> > Tangentially query: is Dveocot smart enough to  optimize mailbox
> renaming
> >  to do index renaming (i.e. does not try to copy or recreate indices)?
> >
> 
> Dovecot is, if you use LAYOUT=index. This will use only mailbox GUID on
> disk, and the folder name is only in indexes (both list index and mailbox
> index for recovery purposes).
> 
> I would recommend using 2.3.21 with LAYOUT=index to avoid problems.
> 

So you can just add this to an existing configuration, without the need to do 
anything? Like eg reindex or so? I always had the impression this affects how 
messages are stored.

mail_location = mdbox:xxxxxx:INDEX=xxxxxx:CONTROL=/xxxxxxx
becomes:
mail_location = mdbox:xxxxxx:INDEX=xxxxxx:CONTROL=/xxxxxxx:LAYOUT:index

Does this really speed things up?

[1]
https://doc.dovecot.org/configuration_manual/mail_location/
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